[doc] more detail of copyright

Improve readability

[Doc][CLI] Update usage and doc of cli executor.

[CLI] fix test_cli

[ASR] fix pad_sequence, remove paddle.size, paddle.static.Variable.size, using paddle.shape()

[doc]add VITS readme, test=tts

Update README_cn.md

Update README.md

[CLI] Dynamic cli commands registration.

[Speechx] refactor example dir && add aishell build TLG script

[server] fix streaming asr

[server][asr] refactor asr streaming server and remove useless code

[server][vector]update the vector model

[speechx] add custom asr script

[vec][doc] update der result

deepspeech2 modify for kunlun

[doc]update readme, test=doc