Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/9200613

    * [Add] add KWS code

    * [Fix] fix kws warning

    * [Add] add ROC for KWS

    * [Update] add some code check

    * [Update] refactor kws code, bug fix

    * [Add] add customized keywords setting for KWS

    * [Add] add data/test/audios for KWS