Extract an LspStore object from Project, to prepare for language support over SSH (#17041)

For ssh remoting lsps we'll need to have language server support
factored out of project.

Thus that begins

Release Notes:

- N/A

---------

Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: Mikayla <mikayla@zed.dev>

crates/collab/src/rpc.rs

@@ -495,6 +495,9 @@ impl Server {
             .add_request_handler(user_handler(
                 forward_read_only_project_request::<proto::InlayHints>,
             ))
+            .add_request_handler(user_handler(
+                forward_read_only_project_request::<proto::ResolveInlayHint>,
+            ))
             .add_request_handler(user_handler(
                 forward_read_only_project_request::<proto::OpenBufferByPath>,
             ))