single click channel (#7596)

- Open channel notes and chat on channel click
- WIP
- Fix compile error
- Don't join live kit until requested
- Track in_call state separately from in_room



Release Notes:

- Improved channels: you can now be in a channel without joining the
audio call automatically

**or**

- N/A

---------

Co-authored-by: Nathan Sobo <nathan@zed.dev>

crates/collab/migrations/20240207041417_add_in_call_column_to_room_participants.sql

@@ -0,0 +1,3 @@
+-- Add migration script here
+
+ALTER TABLE room_participants ADD COLUMN in_call BOOL NOT NULL DEFAULT FALSE;