Add pyright type-checking

[tjkuson]

Hello, I was working with this plugin and encountered this issue.

I added pyright as a tox test matching the mypy hook.

This reveals one error involving function.parent possibly being None. I resolved this by adding an assertion, as that appears to be most consistent with the rest of the codebase.

Closes #731

[tjkuson]

I'll close this for now, there's an issue with pyright and pre-commit CI: RobertCraigie/pyright-python#345

[seifertm]

Rather than running pyright in pre-commit, we can consider running it in a dedicated tox environment. This would give us the benefit of having a pyright check for the code base, while 90% of typing issues should still be caught by the mypy pre-commit hook.

@tjkuson Do you think this approach would side-step the issue?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.88%. Comparing base (07cb01f) to head (5ad6dab).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1172      +/-   ##
==========================================
+ Coverage   88.16%   88.88%   +0.72%     
==========================================
  Files           2        2              
  Lines         397      405       +8     
  Branches       44       44              
==========================================
+ Hits          350      360      +10     
  Misses         35       35              
+ Partials       12       10       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[tjkuson]

@seifertm I've moved the pyright check from pre-commit to tox and re-opened the PR.