replace pyinvoke with tox

[mkmkme]

Pull Request check-list

• Do tests and lints pass with this change?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?

Description of change

This change replaces invoke with tox

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.73%. Comparing base (42a9c44) to head (c347e2c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #106      +/-   ##
==========================================
- Coverage   75.18%   74.73%   -0.46%     
==========================================
  Files         132      132              
  Lines       34480    34480              
==========================================
- Hits        25925    25768     -157     
- Misses       8555     8712     +157     

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[mkmkme]

Just realized the packaging was done via invoke as well. Converting to draft until I decide how to handle this properly.