Add `UtilityWidgets`

lib/src/utils/widgets.dart

@@ -0,0 +1,11 @@
+import 'package:flutter/material.dart';
+
+/// Provides utiulity widgets.
+abstract class UtilityWidgets {
+  /// Conditionally wraps the [child] with [Tooltip] widget if [message]
+  /// is not null and not empty.
+  static Widget maybeTooltip({required Widget child, String? message}) =>
+      (message ?? '').isNotEmpty
+          ? Tooltip(message: message!, child: child)
+          : child;
+}