Development environment improvements and clarifications

[mauvilsa]

What does this PR do?

• Update contribution guidelines.
• Added default python version for pre-commit.
• Don't test python 3.8 in mac and windows.

Before submitting

• Did you read the contributing guideline?
• Did you update the documentation? (readme and public docstrings)
• [n/a] Did you write unit tests such that there is 100% coverage on related code? (required for bug fixes and new features)
• Did you verify that new and existing tests pass locally?
• Did you make sure that all changes preserve backward compatibility?
• [n/a] Did you update the CHANGELOG? (not for typos, docs, test updates, or minor internal changes/refactors)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ec382f1) to head (68567c2).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #688   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines         6688      6688           
=========================================
  Hits          6688      6688           

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

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[PabloLION]

Sorry for the delay. With Python 3.13.1, I tested both pytest (0 fails) and tox.

Desipte ignoring jsonnet and jsonnet-binary, I think you might've forgotten jsonnet-sdist. And its building process is still failing, with similar error message as before.

Ignoring jsonnet-binary: markers 'os_name != "posix" and python_version < "3.13"' don't match your environment
Ignoring jsonnet: markers 'os_name == "posix" and python_version < "3.13"' don't match your environment
Ignoring typing-extensions: markers 'python_version < "3.10"' don't match your environment
...
      error: invalid argument '-std=c++17' not allowed with 'C'
      error: command '/usr/bin/clang' failed with exit code 1
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for jsonnet-sdist
ERROR: Failed to build installable wheels for some pyproject.toml based projects (jsonnet-sdist)

[mauvilsa]

@PabloLION thank you for looking at this. Regarding jsonnet, this will only be fixed once the new release v0.21 comes out, see #682.