Establish WebSocket connection to Cloud (#35734)

This PR adds a new WebSocket connection to Cloud.

This connection will be used to push down notifications from the server
to the client.

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>

crates/cloud_api_client/Cargo.toml

@@ -15,7 +15,10 @@ path = "src/cloud_api_client.rs"
 anyhow.workspace = true
 cloud_api_types.workspace = true
 futures.workspace = true
+gpui.workspace = true
+gpui_tokio.workspace = true
 http_client.workspace = true
 parking_lot.workspace = true
 serde_json.workspace = true
 workspace-hack.workspace = true
+yawc.workspace = true