* Move pinned message hooks to a dedicated file
* Add a banner at the top of a room to display the pinned messages
* Put the pinning banner behind labs pinning labs flag
* Add redacted event support
* Handle UTD in pinning message banner
* Add tests for redaction
* Make all the banner clickable
* Add tests for PinnedMessageBanner.tsx
* Add e2e tests for the pinned message banner
* Review changes
