mobile view mode menu (#8707)

* mobile add view mode menu, disable same menus as desktop
* show forbidden cursor when not view mode && no keyboard permission &&
  not show remote cursor
* hide keyboard/mouse bottom action when keyboard disabled
* fix not listen keyboard permission change
* mobile missing changing resolution and http proxy setting, will add if
  needed.

Signed-off-by: 21pages <sunboeasy@gmail.com>

flutter/lib/web/bridge.dart

@@ -1614,5 +1614,13 @@ class RustdeskImpl {
     throw UnimplementedError();
   }
 
+  bool mainHasValidBotSync({dynamic hint}) {
+    throw UnimplementedError();
+  }
+
+  Future<String> mainVerifyBot({required String token, dynamic hint}) {
+    throw UnimplementedError();
+  }
+
   void dispose() {}
 }