Automatically share project when creating the room

Co-Authored-By: Max Brunsfeld <max@zed.dev>

crates/client/src/incoming_call.rs

@@ -6,4 +6,5 @@ pub struct IncomingCall {
     pub room_id: u64,
     pub caller: Arc<User>,
     pub participants: Vec<Arc<User>>,
+    pub initial_project_id: Option<u64>,
 }

crates/client/src/user.rs

@@ -212,6 +212,7 @@ impl UserStore {
                     this.get_user(envelope.payload.caller_user_id, cx)
                 })
                 .await?,
+            initial_project_id: envelope.payload.initial_project_id,
         };
         this.update(&mut cx, |this, _| {
             *this.incoming_call.0.borrow_mut() = Some(call);