fix: add isReady flag on dispatcher

Author: Sebastian-Iwanczyszyn

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@nestjstools/messaging",
-  "version": "3.0.0",
+  "version": "3.0.1",
   "description": "Simplifies asynchronous and synchronous message handling with support for buses, handlers, channels, and consumers. Build scalable, decoupled applications with ease and reliability.",
   "author": "Sebastian Iwanczyszyn",
   "license": "MIT",

src/consumer/consumer-message-mediator.ts

@@ -11,6 +11,10 @@ export class ConsumerMessageMediator implements ConsumerMessageDispatcher {
     this.$message.next(message);
   }
 
+  isReady(): boolean {
+    return this.$message.observers.length > 0;
+  }
+
   listen(): Observable<ConsumerMessage> {
     return this.$message.asObservable();
   }