feat: payload admin bar (#3684)

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`.

    ```diff
    - 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:

<img width="1057" alt="Screenshot 2025-03-05 at 1 20 04 PM"
src="https://github.com/user-attachments/assets/2597a8fd-da75-4b2f-8979-4fc8132999e8"
/>

---------

Co-authored-by: Kalon Robson <kalon.robson@outlook.com>

test/setupProd.ts

@@ -7,6 +7,7 @@ const dirname = path.dirname(filename)
 
 export const tgzToPkgNameMap = {
   payload: 'payload-*',
+  '@payloadcms/admin-bar': 'payloadcms-admin-bar-*',
   '@payloadcms/db-mongodb': 'payloadcms-db-mongodb-*',
   '@payloadcms/db-postgres': 'payloadcms-db-postgres-*',
   '@payloadcms/db-vercel-postgres': 'payloadcms-db-vercel-postgres-*',