chore: Basic Ruff rule coverage

[junrushao]

Enables a subset of Ruff rules including:

select = [
  "UP",  # pyupgrade, https://docs.astral.sh/ruff/rules/#pyupgrade-up
  "PL",  # pylint, https://docs.astral.sh/ruff/rules/#pylint-pl
  "I",   # isort, https://docs.astral.sh/ruff/rules/#isort-i
  "RUF", # ruff, https://docs.astral.sh/ruff/rules/#ruff-specific-rules-ruf
  "NPY", # numpy, https://docs.astral.sh/ruff/rules/#numpy-specific-rules-npy
  "F",   # pyflakes, https://docs.astral.sh/ruff/rules/#pyflakes-f
  # "ANN", # flake8-annotations, https://docs.astral.sh/ruff/rules/#flake8-annotations-ann
  "PTH", # flake8-use-pathlib, https://docs.astral.sh/ruff/rules/#flake8-use-pathlib-pth
  "D", # pydocstyle, https://docs.astral.sh/ruff/rules/#pydocstyle-d
]