feat: lock documents while being edited (#7970)

## Description

Adds a new property to `collection` / `global` configs called
`lockDocuments`.

Set to `true` by default - the lock is automatically triggered when a
user begins editing a document within the Admin Panel and remains in
place until the user exits the editing view or the lock expires due to
inactivity.

Set to `false` to disable document locking entirely - i.e.
`lockDocuments: false`

You can pass an object to this property to configure the `duration` in
seconds, which defines how long the document remains locked without user
interaction. If no edits are made within the specified time (default:
300 seconds), the lock expires, allowing other users to edit / update or
delete the document.

```
lockDocuments: {
  duration: 180, // 180 seconds or 3 minutes
}
```

- [x] I have read and understand the
[CONTRIBUTING.md](https://github.com/payloadcms/payload/blob/main/CONTRIBUTING.md)
document in this repository.

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## Checklist:

- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] Existing test suite passes locally with my changes
- [x] I have made corresponding changes to the documentation

.github/workflows/main.yml

@@ -310,6 +310,7 @@ jobs:
           - fields__collections__Upload
           - live-preview
           - localization
+          - locked-documents
           - i18n
           - plugin-cloud-storage
           - plugin-form-builder