feat(mobile): custom video player controls (#2960)

* Remove toggle fullscreen button

* Implement custom video player controls

* Move Padding into Container

mobile/lib/modules/asset_viewer/providers/show_controls.provider.dart

@@ -0,0 +1,21 @@
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+final showControlsProvider = StateNotifierProvider<ShowControls, bool>((ref) {
+  return ShowControls(ref);
+});
+
+class ShowControls extends StateNotifier<bool> {
+  ShowControls(this.ref) : super(true);
+
+  final Ref ref;
+
+  bool get show => state;
+
+  set show(bool value) {
+    state = value;
+  }
+
+  void toggle() {
+    state = !state;
+  }
+}