Replace my with ty

[norlandrhagen]

pixi run run-ty

Found 135 diagnostics 💀

AFAICT ty doesn't have a way to ignore specific libraries. I set some really minimal rules/warnings, but we can add more if we want. You can also suppress specific lines . Maybe we can use this for third-party libs with missing stubs?

• Closes Replace mypy with ty #592
• Full type hint coverage
• Changes are documented in docs/releases.rst
• New functionality has documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.12%. Comparing base (c67dcc1) to head (e90a68d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #842      +/-   ##
==========================================
- Coverage   89.22%   89.12%   -0.11%     
==========================================
  Files          34       34              
  Lines        1987     1987              
==========================================
- Hits         1773     1771       -2     
- Misses        214      216       +2     

see 1 file with indirect coverage changes

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