Add “Per Page Limit” option to Notifications Drawer

Summary The notifications drawer currently only supports fixed pagination (25 per page). Unlike other Directus collections, it does not allow selecting how many records to view per page. Additional Context I’ve already implemented this feature in a custom Directus, and it works well. I’m happy to help contribute this upstream with a PR if the community agrees. I can also share screenshots or code snippets of my implementation if that helps with the discussion. <img width="1058" height="891" alt="image" src=" /> Basic Example In the notifications drawer, add a dropdown to select per-page limit: 25 (default) 50 100 500 1000 This would function the same way as the per-page selector in collection views. Motivation 1. Users with many notifications (e.g., 200+) must click through multiple pages (25 at a time). 2. This is inefficient and inconsistent compared to other parts of Directus. 3. Adding a per-page limit improves usab…