Add pre-commit

[cclauss]

https://pre-commit.com

% pre-commit run --all-files

check for added large files..............................................Passed
check python ast.........................................................Passed
check for case conflicts.................................................Passed
check docstring is first.................................................Passed
check json...............................................................Passed
check for merge conflicts................................................Passed
check that scripts with shebangs are executable..........................Passed
check for broken symlinks............................(no files to check)Skipped
check toml...............................................................Passed
check vcs permalinks.....................................................Passed
check xml............................................(no files to check)Skipped
check yaml...............................................................Passed
debug statements (python)................................................Passed
detect destroyed symlinks................................................Passed
detect private key.......................................................Passed
fix end of files.........................................................Passed
file contents sorter.................................(no files to check)Skipped
fix utf-8 byte order marker..............................................Passed
forbid new submodules................................(no files to check)Skipped
forbid submodules....................................(no files to check)Skipped
fix requirements.txt.....................................................Passed
sort simple yaml files...............................(no files to check)Skipped
trim trailing whitespace.................................................Passed
auto-walrus..............................................................Passed
codespell................................................................Passed
ruff check...............................................................Passed
pyproject-fmt............................................................Passed
Validate pyproject.toml..................................................Passed

Please remove Required test ci/circleci: Python3 below because that CircleCI job has been renamed topytest.