driver: add initial type hints for common driver code

[rpoisel]

Description

This PR starts adding type annotations incrementally, as discussed in #1945.

It adds ty as a development dependency and configures it to check a small initial module of the codebase: labgrid/driver/common.py.

Verified locally with:

uv run --extra dev pytest tests/test_driver_common.py
uv run ruff check labgrid/driver/common.py tests/test_driver_common.py
uv run ruff format --check --diff labgrid/driver/common.py tests/test_driver_common.py
uv run ty check

Checklist

• Documentation for the feature
• Tests for the feature
• The arguments and description in doc/configuration.rst have been updated
• Add a section on how to use the feature to doc/usage.rst
• Add a section on how to use the feature to doc/development.rst
• PR has been tested
• Man pages have been regenerated

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.0%. Comparing base (424a0b7) to head (427d66f).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1946   +/-   ##
======================================
  Coverage    61.0%   61.0%           
======================================
  Files         182     182           
  Lines       14898   14902    +4     
======================================
+ Hits         9094    9104   +10     
+ Misses       5804    5798    -6     

Flag	Coverage Δ
3.10	61.0% <100.0%> (+<0.1%)	⬆️
3.11	61.0% <100.0%> (+<0.1%)	⬆️
3.12	61.0% <100.0%> (+<0.1%)	⬆️
3.13	61.0% <100.0%> (+<0.1%)	⬆️
3.14	61.0% <100.0%> (+<0.1%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

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

[Emantor]

Changes look good to me, do you also want to add a ty check run to this PR for the CI or is it too early for that?

[rpoisel]

Do you also want to add a ty check run to this PR for the CI or is it too early for that?

Thanks for your approval!

I'd be happy to add such check to CI. If you don't mind, I'd do that in a separate commit.

EDIT: just re-pushed to get the commit of this PR verified.