open new buffer (#11203)

Release Notes:

- Allow creating new untitled buffers in remote projects

TODO:
- Add a Test
- Fix version number check

crates/rpc/src/proto.rs

@@ -319,7 +319,8 @@ messages!(
     (MultiLspQueryResponse, Background),
     (RemoteProjectsUpdate, Foreground),
     (ValidateRemoteProjectRequest, Background),
-    (DeleteDevServer, Foreground)
+    (DeleteDevServer, Foreground),
+    (OpenNewBuffer, Foreground)
 );
 
 request_messages!(
@@ -377,6 +378,7 @@ request_messages!(
     (OpenBufferById, OpenBufferResponse),
     (OpenBufferByPath, OpenBufferResponse),
     (OpenBufferForSymbol, OpenBufferForSymbolResponse),
+    (OpenNewBuffer, OpenBufferResponse),
     (PerformRename, PerformRenameResponse),
     (Ping, Ack),
     (PrepareRename, PrepareRenameResponse),
@@ -453,6 +455,7 @@ entity_messages!(
     LeaveProject,
     MultiLspQuery,
     OnTypeFormatting,
+    OpenNewBuffer,
     OpenBufferById,
     OpenBufferByPath,
     OpenBufferForSymbol,