fix(mta): Expose HttpResponse.statusCode and add explicit generic type annotations in DNSManager cache retrieval

ts/mta/mta.classes.apimanager.ts

@@ -141,7 +141,7 @@ class HttpResponse {
   private headers: Record<string, string> = {
     'Content-Type': 'application/json'
   };
-  private statusCode: number = 200;
+  public statusCode: number = 200;
   
   constructor(private res: any) {}