fix: add missing Rooms interface

Added Rooms interface, that was missing during in public API PR

Author: ttypic

chat-android/src/main/java/com/ably/chat/ChatClient.kt

@@ -12,7 +12,7 @@ interface ChatClient {
     /**
      * The rooms object, which provides access to chat rooms.
      */
-    val room: Room
+    val rooms: Rooms
 
     /**
      * The underlying connection to Ably, which can be used to monitor the clients

chat-android/src/main/java/com/ably/chat/Rooms.kt

@@ -0,0 +1,37 @@
+package com.ably.chat
+
+/**
+ * Manages the lifecycle of chat rooms.
+ */
+interface Rooms {
+    /**
+     * Get the client options used to create the Chat instance.
+     */
+    val clientOptions: ClientOptions
+
+    /**
+     * Gets a room reference by ID. The Rooms class ensures that only one reference
+     * exists for each room. A new reference object is created if it doesn't already
+     * exist, or if the one used previously was released using release(roomId).
+     *
+     * Always call `release(roomId)` after the Room object is no longer needed.
+     *
+     * @param roomId The ID of the room.
+     * @param options The options for the room.
+     * @throws {@link ErrorInfo} if a room with the same ID but different options already exists.
+     * @returns Room A new or existing Room object.
+     */
+    fun get(roomId: String, options: RoomOptions): Room
+
+    /**
+     * Release the Room object if it exists. This method only releases the reference
+     * to the Room object from the Rooms instance and detaches the room from Ably. It does not unsubscribe to any
+     * events.
+     *
+     * After calling this function, the room object is no-longer usable. If you wish to get the room object again,
+     * you must call {@link Rooms.get}.
+     *
+     * @param roomId The ID of the room.
+     */
+    suspend fun release(roomId: String)
+}