feat(base): Implement Client::rooms_stream.

This patch implements `Client::rooms_stream`, which forwards the result
of the recently added `Store::rooms_stream` method.

crates/matrix-sdk-base/src/client.rs

@@ -21,6 +21,8 @@ use std::{
 use std::{ops::Deref, sync::Arc};
 
 use eyeball::{SharedObservable, Subscriber};
+use eyeball_im::{Vector, VectorDiff};
+use futures_util::Stream;
 use matrix_sdk_common::instant::Instant;
 #[cfg(feature = "e2e-encryption")]
 use matrix_sdk_crypto::{
@@ -169,6 +171,11 @@ impl BaseClient {
         self.store.rooms_filtered(filter)
     }
 
+    /// Get a stream of all the rooms, in addition to the existing rooms.
+    pub fn rooms_stream(&self) -> (Vector<Room>, impl Stream<Item = Vec<VectorDiff<Room>>>) {
+        self.store.rooms_stream()
+    }
+
     /// Lookup the Room for the given RoomId, or create one, if it didn't exist
     /// yet in the store
     pub fn get_or_create_room(&self, room_id: &RoomId, room_state: RoomState) -> Room {