Add support for importing page aliases and external links

[mlocati]

See concretecms/concretecms#12293 (comment)

[mlocati]

This PR should be ready, it should be able to import a CIF like this:

<?xml version="1.0" encoding="UTF-8"?>
<concrete5-cif version="1.0">
    <pages>
        <page name="Home" path="" public-date="2023-02-14 09:06:18" filename="" pagetype="page" template="full" user="admin" description="" package="" root="true">
            <locale language="en" country="US"/>
            <hreflang>
                <alternate locale="fr_FR" path="/fr" />
                <alternate locale="it_IT" path="/it" />
            </hreflang>
            <area name="Main">
                <blocks>
                    <block type="content">
                        <style>
                            <borderWidth>2px</borderWidth>
                            <borderColor>rgba(255,0,0,1)</borderColor>
                            <borderStyle>solid</borderStyle>
                            <borderRadius>10px</borderRadius>
                        </style>
                        <data table="btContentLocal"><record><content>Content for page '/'</content></record></data>
                    </block>
                </blocks>
            </area>
        </page>
        <page name="Home IT" path="/it" user="admin" public-date="2025-01-16 16:00:22" filename="" pagetype="" template="full" description="" root="true" package="">
            <locale language="it" country="IT"/>
            <hreflang>
                <alternate locale="en_US" path="/" />
                <alternate locale="fr_FR" path="/fr" />
            </hreflang>
            <area name="Main">
                <blocks>
                    <block type="content">
                        <style>
                            <borderWidth>2px</borderWidth>
                            <borderColor>rgba(255,0,0,1)</borderColor>
                            <borderStyle>solid</borderStyle>
                            <borderRadius>10px</borderRadius>
                        </style>
                        <data table="btContentLocal"><record><content>Content for page '/it'</content></record></data>
                    </block>
                </blocks>
            </area>
        </page>
        <page name="Home FR" path="/fr" user="admin" public-date="2024-11-07 13:37:00" template="full" root="true">
            <locale language="fr" country="FR" />
            <hreflang>
                <alternate locale="en_US" path="/" />
                <alternate locale="it_IT" path="/" />
            </hreflang>
            <area name="Main">
                <blocks>
                    <block type="content">
                        <style>
                            <borderWidth>2px</borderWidth>
                            <borderColor>rgba(255,0,0,1)</borderColor>
                            <borderStyle>solid</borderStyle>
                            <borderRadius>10px</borderRadius>
                        </style>
                        <data table="btContentLocal"><record><content>Content for page '/fr'</content></record></data>
                    </block>
                </blocks>
            </area>
        </page>
        <page name="Example" path="/example" user="admin" public-date="2024-11-07 13:37:54" filename="" pagetype="page" template="full" package="">
            <additional-path path="/test" />
            <hreflang>
                <alternate locale="fr_FR" path="/fr/exemple" />
            </hreflang>
            <area name="Main">
                <blocks>
                    <block type="content">
                        <style>
                            <borderWidth>2px</borderWidth>
                            <borderColor>rgba(255,0,0,1)</borderColor>
                            <borderStyle>solid</borderStyle>
                            <borderRadius>10px</borderRadius>
                        </style>
                        <data table="btContentLocal"><record><content>Content for page '/example'</content></record></data>
                    </block>
                </blocks>
            </area>
        </page>
        <page name="Exemple" path="/fr/exemple" user="admin" public-date="2024-11-07 13:37:00" filename="" pagetype="page" template="full" package="">
            <hreflang>
                <alternate locale="en_US" path="/example" />
            </hreflang>
            <area name="Main">
                <blocks>
                    <block type="content">
                        <style>
                            <borderWidth>2px</borderWidth>
                            <borderColor>rgba(255,0,0,1)</borderColor>
                            <borderStyle>solid</borderStyle>
                            <borderRadius>10px</borderRadius>
                        </style>
                        <data table="btContentLocal"><record><content>Content for page '/fr/exemple'</content></record></data>
                    </block>
                </blocks>
            </area>
        </page>
        <external-link name="External Link" path="/fr/go-out" destination="https://path.to/url?p1=one&amp;p2=two" new-window="true" user="admin" public-date="2024-11-09 12:38:54" package="" />
        <alias name="Alias Name" path="/fr/alias" original-path="/fr/exemple" user="admin" package="" />
        <page name="/a/b" path="/a/b" user="admin" public-date="2024-11-07 13:37:00" pagetype="page" template="full" />
        <alias name="/d" path="/d" original-path="/a/b" user="admin" />
        <page name="/a" path="/a" user="admin" public-date="2024-11-07 13:37:00" pagetype="page" template="full" />
        <page name="/d/e" path="/d/e" user="admin" public-date="2024-11-07 13:37:00" pagetype="page" template="full" />
    </pages>
    <stacks>
        <folder name="Root Folder" path="/" />
        <folder name="A/B Test" path="/Root Folder" />
        <stack name="Stack Name" path="/Root Folder/A/B Test">
            <area name="Main">
                <blocks>
                    <block type="content">
                        <style>
                            <borderWidth>2px</borderWidth>
                            <borderColor>rgba(255,0,0,1)</borderColor>
                            <borderStyle>solid</borderStyle>
                            <borderRadius>10px</borderRadius>
                        </style>
                        <data table="btContentLocal"><record><content>Content for stack (neutral)</content></record></data>
                    </block>
                </blocks>
            </area>
        </stack>
        <stack name="Stack Name" path="/Root Folder/A/B Test" section="it_IT">
            <area name="Main">
                <blocks>
                    <block type="content" custom-template="my_custom_template">
                        <style>
                            <borderWidth>2px</borderWidth>
                            <borderColor>rgba(255,0,0,1)</borderColor>
                            <borderStyle>solid</borderStyle>
                            <borderRadius>10px</borderRadius>
                        </style>
                        <data table="btContentLocal"><record><content>Content for stack (it_IT)</content></record></data>
                    </block>
                </blocks>
            </area>
        </stack>
    </stacks>
</concrete5-cif>

[mlocati]

In this PR I added the new property/setting Destination of the publication to the Import\Batch entity.

Here it is when creating a new import batch:

And here it is when edining the basic details of an existing batch:

Hovering the question marks, we have these tooltips:

Why? When importing a page that's the root of a language, we need to create a new multilingual section (aka tree), and doing that under the /!import_batches/{batch-id} system page.

Creating multilingual sections is also required in order to import the localized versions of stacks and global areas.

By default, the setting is backward compatible, meaning that pages will be imported under the /!import_batches/{batch-id} system page and we won't create multilingual.