[WIP] synctools: use new builders

[rfc2822]

Depends on bitfireAT/synctools#51

Purpose

What this PR is intended to do and why this is desirable.

Example:

Adds support for AAA in BBB, as requested by several people in issue #XX.

Short description

A short description of the chosen approach to achieve the purpose.

Example:

• Added authentication option Some authentication to some module.
• Added support for Some authentication to some content provider.
• Added UI support for Some authentication in account settings.

Related information (links to Android docs and other resources that help to understand/review
the changes) can also be put here.

Checklist

• The PR has a proper title, description and label.
• I have self-reviewed the PR.
• I have added documentation to complex functions and functions that can be used by other modules.
• I have added reasonable tests or consciously decided to not add tests.

[github-actions]

This PR/issue depends on:

• Add new event Entity builder logic that is used beside legacy builder synctools#51

[rfc2822]

Will be created again after new synctools PR