[next]: Add toolbar integration to kitchen sink example

[ahuseyn]

Tasks

• I have signed a Contributor License Agreement (CLA) with WP Engine.
• If a code change, I have written testing instructions that the whole team & outside contributors can understand.
• I have written and included a comprehensive changeset to properly document the changes I've made.

Description

This PR integrates HWP Toolbar into Faust kitchen-sink (nextjs) example. It uses existing template-hierarchy and auth packages, and draft-mode feature to provide the context to the toolbar.

Related Issue(s):

• [next]: Integrate Toolbar into Kitchen Sink Example #2194

Testing

Screenshots

• Link to Faust docs, wpadmin link and link to logged in user profile

• Exit preview button when Draft mode is on

• Edit post/page link, when visiting post/page

Documentation Changes

Dependant PRs

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Latest commit: 81a807b

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