client: Add CloudUserStore (#35370)

This PR adds a new `CloudUserStore` for storing information about the
user retrieved from Cloud instead of Collab.

Release Notes:

- N/A

crates/client/src/client.rs

@@ -1,6 +1,7 @@
 #[cfg(any(test, feature = "test-support"))]
 pub mod test;
 
+mod cloud;
 mod proxy;
 pub mod telemetry;
 pub mod user;
@@ -52,6 +53,7 @@ use tokio::net::TcpStream;
 use url::Url;
 use util::{ConnectionResult, ResultExt};
 
+pub use cloud::*;
 pub use rpc::*;
 pub use telemetry_events::Event;
 pub use user::*;
@@ -621,6 +623,10 @@ impl Client {
         self.http.clone()
     }
 
+    pub fn cloud_client(&self) -> Arc<CloudApiClient> {
+        self.cloud_client.clone()
+    }
+
     pub fn set_id(&self, id: u64) -> &Self {
         self.id.store(id, Ordering::SeqCst);
         self