added loading indicator for mapview

lib/util/loadingContainer.dart

@@ -0,0 +1,23 @@
+import 'package:flutter/material.dart';
+
+class LoadingContainer extends StatelessWidget {
+  final bool loading;
+  final bool fetching;
+  final Widget child;
+  const LoadingContainer({required this.loading, required this.fetching, required this.child, super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    if(loading) {
+      return const Center(child: CircularProgressIndicator());
+    }
+
+    return Column(
+      mainAxisSize: MainAxisSize.max,
+      children: [
+        if(fetching) const LinearProgressIndicator(),
+        Expanded(child: child),
+      ],
+    );
+  }
+}