Introduce call infrastructure

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

crates/rpc/src/proto.rs

@@ -83,6 +83,7 @@ messages!(
     (ApplyCompletionAdditionalEditsResponse, Background),
     (BufferReloaded, Foreground),
     (BufferSaved, Foreground),
+    (Call, Foreground),
     (ChannelMessageSent, Foreground),
     (CopyProjectEntry, Foreground),
     (CreateBufferForPeer, Foreground),
@@ -117,6 +118,7 @@ messages!(
     (GetProjectSymbols, Background),
     (GetProjectSymbolsResponse, Background),
     (GetUsers, Foreground),
+    (IncomingCall, Foreground),
     (UsersResponse, Foreground),
     (JoinChannel, Foreground),
     (JoinChannelResponse, Foreground),
@@ -151,6 +153,7 @@ messages!(
     (RequestJoinProject, Foreground),
     (RespondToContactRequest, Foreground),
     (RespondToJoinProjectRequest, Foreground),
+    (RoomUpdated, Foreground),
     (SaveBuffer, Foreground),
     (SearchProject, Background),
     (SearchProjectResponse, Background),
@@ -179,6 +182,7 @@ request_messages!(
         ApplyCompletionAdditionalEdits,
         ApplyCompletionAdditionalEditsResponse
     ),
+    (Call, Ack),
     (CopyProjectEntry, ProjectEntryResponse),
     (CreateProjectEntry, ProjectEntryResponse),
     (CreateRoom, CreateRoomResponse),
@@ -200,6 +204,7 @@ request_messages!(
     (JoinChannel, JoinChannelResponse),
     (JoinProject, JoinProjectResponse),
     (JoinRoom, JoinRoomResponse),
+    (IncomingCall, Ack),
     (OpenBufferById, OpenBufferResponse),
     (OpenBufferByPath, OpenBufferResponse),
     (OpenBufferForSymbol, OpenBufferForSymbolResponse),