migrate from setup.cfg to pyproject.toml

[briantist]

Fixes #91

• migrates everything from setup.cfg to pyproject.toml (also update some fields)
• remove ./tests/requirements.txt and ./requirements.txt
• add a [tests] requirements group to the project (and use it in CI)
• bump version to 0.10.1-dev0

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (7f22220) 56.77% compared to head (3ada378) 56.77%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #93   +/-   ##
=======================================
  Coverage   56.77%   56.77%           
=======================================
  Files          27       27           
  Lines        1011     1011           
=======================================
  Hits          574      574           
  Misses        437      437           

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