Use LiveKit's Rust SDK on Linux while continue using Swift SDK on Mac (#21550)

Similar to #20826 but keeps the Swift implementation. There were quite a
few changes in the `call` crate, and so that code now has two variants.

Closes #13714

Release Notes:

- Added preliminary Linux support for voice chat and viewing
screenshares.

---------

Co-authored-by: Kirill Bulatov <mail4score@gmail.com>
Co-authored-by: Kirill Bulatov <kirill@zed.dev>
Co-authored-by: Mikayla <mikayla@zed.dev>

crates/collab/src/db/queries/channels.rs

@@ -154,9 +154,9 @@ impl Database {
             }
             let role = role.unwrap();
 
-            let live_kit_room = format!("channel-{}", nanoid::nanoid!(30));
+            let livekit_room = format!("channel-{}", nanoid::nanoid!(30));
             let room_id = self
-                .get_or_create_channel_room(channel_id, &live_kit_room, &tx)
+                .get_or_create_channel_room(channel_id, &livekit_room, &tx)
                 .await?;
 
             self.join_channel_room_internal(room_id, user_id, connection, role, &tx)
@@ -896,7 +896,7 @@ impl Database {
     pub(crate) async fn get_or_create_channel_room(
         &self,
         channel_id: ChannelId,
-        live_kit_room: &str,
+        livekit_room: &str,
         tx: &DatabaseTransaction,
     ) -> Result<RoomId> {
         let room = room::Entity::find()
@@ -909,7 +909,7 @@ impl Database {
         } else {
             let result = room::Entity::insert(room::ActiveModel {
                 channel_id: ActiveValue::Set(Some(channel_id)),
-                live_kit_room: ActiveValue::Set(live_kit_room.to_string()),
+                live_kit_room: ActiveValue::Set(livekit_room.to_string()),
                 ..Default::default()
             })
             .exec(tx)

crates/collab/src/db/queries/rooms.rs

@@ -103,11 +103,11 @@ impl Database {
         &self,
         user_id: UserId,
         connection: ConnectionId,
-        live_kit_room: &str,
+        livekit_room: &str,
     ) -> Result<proto::Room> {
         self.transaction(|tx| async move {
             let room = room::ActiveModel {
-                live_kit_room: ActiveValue::set(live_kit_room.into()),
+                live_kit_room: ActiveValue::set(livekit_room.into()),
                 ..Default::default()
             }
             .insert(&*tx)
@@ -1316,7 +1316,7 @@ impl Database {
             channel,
             proto::Room {
                 id: db_room.id.to_proto(),
-                live_kit_room: db_room.live_kit_room,
+                livekit_room: db_room.live_kit_room,
                 participants: participants.into_values().collect(),
                 pending_participants,
                 followers,