GameRecorder.pause() 等方法应该 Promise 调用

[zhouzhuo810]

https://developers.weixin.qq.com/minigame/dev/api/game-recorder/GameRecorder.pause.html

这几个方法应该改成Promise调用：

  Future<dynamic> abort() {
    final result = $$context$$.callMethodAwaitPromise('abort', []);
    return result;
  }

  Future<dynamic> pause() {
    final result = $$context$$.callMethodAwaitPromise('pause', []);
    return result;
  }

  Future<dynamic> resume() {
    final result = $$context$$.callMethodAwaitPromise('resume', []);
    return result;
  }

  Future<dynamic> stop() {
    final result = $$context$$.callMethodAwaitPromise('stop', []);
    return result;
  }