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.sqlite/20221109000000_test_schema.sql

@@ -163,7 +163,8 @@ CREATE TABLE "room_participants" (
     "calling_connection_id" INTEGER NOT NULL,
     "calling_connection_server_id" INTEGER REFERENCES servers (id) ON DELETE SET NULL,
     "participant_index" INTEGER,
-    "role" TEXT
+    "role" TEXT,
+    "in_call" BOOLEAN NOT NULL DEFAULT FALSE
 );
 CREATE UNIQUE INDEX "index_room_participants_on_user_id" ON "room_participants" ("user_id");
 CREATE INDEX "index_room_participants_on_room_id" ON "room_participants" ("room_id");