CI/Lint: Add pyright and isort to the project

[ByteOtter]

What this PR does / why we need it:

To improve general code quality (and also safety) this PR adds pyright and isort to the project for linting and import sorting respectively.

Later I will also gradually address all the errors the pyright linter finds in accordance to it's pyrightconfig.json and its strict mode rules

To not make it too noisy, I downgraded some of its default errors down to warnings if they are non-critical edge-cases or more style related than functional.

Another goal is to gradually add proper type annotations to the codebase in future PRs.

Which issue(s) this PR fixes:
Tracks (not fully fixes) #152

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.10%. Comparing base (d2eca70) to head (2cb552d).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #168   +/-   ##
=======================================
  Coverage   93.10%   93.10%           
=======================================
  Files          30       30           
  Lines        1348     1349    +1     
=======================================
+ Hits         1255     1256    +1     
  Misses         93       93           

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[ByteOtter]

So far, this PR is done. The linting CI has been improved by adding isort and pyright. The current failure stems from countless pyright errors (mostly related to typing) that I would like to fix in a separate PR.