Modernize the code base

[MatthieuDartiailh]

In particular:

• use isort, black, flake8 to lint the code source
• add typing to the code source and use mypy to check it
• add pre-commit hooks
• update the format of the docstrings to use the Numpy standard
• update the CI configuration and add a release automation workflow

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@0b8bb01). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #67   +/-   ##
=======================================
  Coverage        ?   82.52%           
=======================================
  Files           ?       15           
  Lines           ?     1076           
  Branches        ?      167           
=======================================
  Hits            ?      888           
  Misses          ?      142           
  Partials        ?       46           

Flag	Coverage Δ
unittests	82.52% <0.00%> (?)

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