feat: payload admin bar

[jacobsfletch]

Imports https://github.com/payloadcms/payload-admin-bar into the Payload monorepo. This package will now be regularly maintained directly alongside all Payload packages and now includes its own test suite.

A few changes minor have been made between v1.0.7 and latest:

1. The package name has changed from payload-admin-bar to @payloadcms/admin-bar.

   - import { PayloadAdminBar } from 'payload-admin-bar'
   + import { PayloadAdminBar } from '@payloadcms/admin-bar'

2. The collection prop has been renamed to collectionSlug

3. The authCollection prop has been renamed to authCollectionSlug

Here's a screenshot of the admin bar in use within the Website Template:

[denolfe]

Do we plan on supporting this plugin for 3.0?

If so, we need to get this building, and we can get it imported.

[jacobsfletch]

This isn't a plugin, it's a standalone pkg. This is something we will want to continue to maintain. I'll see about updating this PR.

[denolfe]

Looks good. A screenshot in the PR description would be nice, as many likely have not seen this 👍

[denolfe]

Looks like the normal build flow was somehow skipped. Should figure that out before merging.

[github-actions]

🚀 This is included in version v3.27.0

[ecosse3]

Thank you for merging it into core. Do you have plans to add support for multiple locales when using localized Payload with Next.js with next-intl package? Right now text is hardcoded in English.