* [Enhancement] upgrade isort in pre-commit config by refering to mmflow pr #87
* fix lint
* remove .isort.cfg and put its known_third_party to setup.cfg
* add speed benchmark for pplnn and replace all ppl in docs with pplnn
* replace ppl with pplnn for all codes
* docs zh
* fix crnn config path
* update docstring
* rename
* update ppl to pplnn in readme_zh
Co-authored-by: maningsheng <mnsheng@yeah.net>