feat: helper Channel#muted to expose the muted option

src/classes/Channel.ts

@@ -285,7 +285,7 @@ export class Channel {
   }
 
   /**
-   * Get whether this channel is unread.
+   * Whether this channel is unread
    */
   get unread(): boolean {
     if (
@@ -303,6 +303,13 @@ export class Channel {
     );
   }
 
+  /**
+   * Whether this channel is muted
+   */
+  get muted(): boolean {
+    return this.#collection.client.options.channelIsMuted(this);
+  }
+
   /**
    * Get mentions in this channel for user.
    */