Refactor WorkerImpl to integrate logging, enhance testing with mocks, improve timeout and error handling, and add worker ID generation.

finlog_app/fluttery/test/mocks/mocks.dart

@@ -2,3 +2,24 @@ import 'package:fluttery/logger.dart';
 import 'package:mocktail/mocktail.dart';
 
 class MockLogger extends Mock implements Logger {}
+
+class MockUtils {
+  static Logger mockLogger() {
+    final logger = MockLogger();
+
+    when(() => logger.debug(any())).thenAnswer((a) {
+      print("[DEBUG] ${a.positionalArguments[0]}");
+    });
+    when(() => logger.info(any())).thenAnswer((a) {
+      print("[INFO] ${a.positionalArguments[0]}");
+    });
+    when(() => logger.warning(any())).thenAnswer((a) {
+      print("[WARN] ${a.positionalArguments[0]}");
+    });
+    when(() => logger.error(any(), any(), any())).thenAnswer((a) {
+      print("[ERROR] ${a.positionalArguments[0]}\n${a.positionalArguments[2]}");
+    });
+
+    return logger;
+  }
+}