Switch to poetry and drop python3.7 support

[cortadocodes]

Contents (#115)

Operations

• Switch to poetry for package management
• Use ruff instead of flake8, black, and isort
• Drop support for python3.7
• Stop using tox to test

Dependencies

• Add ruff dev dependency

Other

• Update copyright years

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.78%. Comparing base (58a173c) to head (4c45540).
Report is 14 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #115   +/-   ##
=======================================
  Coverage   87.78%   87.78%           
=======================================
  Files           7        7           
  Lines         262      262           
=======================================
  Hits          230      230           
  Misses         32       32           

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