* Add pyupgrade pre-commit hook

* fix ut

* remove comments

* Replace markdownlint with mdformat to avoid installing ruby

* fix circleci

* pull flake8 from github

* pull flake8 from github

* add config test

* Fix typo

Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* Update tests/config/test_config.py

Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* Reconstruct config test

* Fix import logic and error test

* Fix path error

* Restructuring Config

* simplify test logic

simplify test logic

* rename test_config file

* add test complex dump and pretty text

* adjust test sequence according to comment

adjust test sequence according to comment

* add comment and test for simple.config.py

* add config test data

* add init

* remove __pycache__

* fix as comment

* add syntax test case

* remove tmp path and modify comment

* add test for setattr

Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* Add the unittest of registry

* improve the format

* fix the test_repr

* refactor the test_init

* add the copyright for tests directory

* add more unit tests

* fix error

* add unit tests for _search_child and _get_root_registry

* build_from_cfg supports dict, ConfictDict and Config

* improve docstring

* [Docs] Configure the documentation

* delete mypy.ini