开启听写识别会话。听写识别只能在不运行 PhraseRecognitionSystem 时启动。
DictationRecognizer 要求在用户的语音隐私政策（Settings > Privacy > Speech，inking & typing）中允许听写。如果听写未启用，DictationRecognizer 将会在 Start 上失败。开发者可以通过提供 DictationError 委托和测试 SPERR_SPEECH_PRIVACY_POLICY_NOT_ACCEPTED (0x80045509)，以特定于此应用程序的方式处理此故障。
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