feat: add publishing & audio to ffi (#46)

- Divide FFI protocol into multiple files
- Audio support
- AV Streams/Sources
- Create tracks
- Use Dashmap to store handles
- Add a capture test
     - Ignored by GHA atm

livekit-api/src/access_token.rs

@@ -64,7 +64,7 @@ impl Default for VideoGrants {
             room_list: false,
             room_record: false,
             room_admin: false,
-            room_join: false,
+            room_join: true,
             room: "".to_string(),
             can_publish: true,
             can_subscribe: true,