opt: add microphone permission tip

flutter/lib/common.dart

@@ -1723,3 +1723,30 @@ Future<void> updateSystemWindowTheme() async {
     }
   }
 }
+/// macOS only
+///
+/// Note: not found a general solution for rust based AVFoundation bingding.
+/// [AVFoundation] crate has compile error.
+const kMacOSPermChannel = MethodChannel("org.rustdesk.rustdesk/macos");
+
+enum PermissionAuthorizeType {
+  undetermined,
+  authorized,
+  denied, // and restricted
+}
+
+Future<PermissionAuthorizeType> osxCanRecordAudio() async {
+  int res = await kMacOSPermChannel.invokeMethod("canRecordAudio");
+  print(res);
+  if (res > 0) {
+    return PermissionAuthorizeType.authorized;
+  } else if (res == 0) {
+    return PermissionAuthorizeType.undetermined;
+  } else {
+    return PermissionAuthorizeType.denied;
+  }
+}
+
+Future<bool> osxRequestAudio() async {
+  return await kMacOSPermChannel.invokeMethod("requestRecordAudio");
+}