adding pre-commit tool into the workflow

[akkik04]

Closes #607

Summary

Adds a minimal pre-commit configuration so pylint runs automatically on changed Python files when committing.

• Introduces .pre-commit-config.yaml with two local hooks:
  • pylint (clickhouse_connect) – runs pylint only on changed Python files under clickhouse_connect/
  • pylint (tests) – runs pylint only on changed Python files under tests/
• Hooks use the existing pylintrc and do not add any extra formatting/whitespace checks beyond what pylint already enforces.

This keeps the current linting behavior but automates it at commit time and limits the scope to modified files instead of re-linting the entire repo.

(Usage example for contributors):

pip install -r requirements-dev.txt
pre-commit install

Checklist

Delete items not relevant to your PR:

• Unit and integration tests covering the common scenarios were added
• A human-readable description of the changes was provided to include in CHANGELOG
• For significant changes, documentation in https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials

[joe-clickhouse]

Hi @akkik04, This is great! Thanks, I've been meaning to get around to doing this for a while now. I'm in and out over the next week so I'll get it approved when I'm back.

[akkik04]

Hi @akkik04, This is great! Thanks, I've been meaning to get around to doing this for a while now. I'm in and out over the next week so I'll get it approved when I'm back.

Sounds good, thanks!

[joe-clickhouse]

Look good! Just want to pin the pylint and astroid versions to match what's run in CI.

[joe-clickhouse]

Failing because pre-commit 4.5.1 specifies python_requires >= 3.10 but we still test against 3.9. Looks like pre-commit v4.3.0 allows python 3.9 so maybe pin pre-commit to v4.3.0. Separately, I'll need to do some work to drop clickhouse-connect's support for 3.9.

[akkik04]

addressed.

[joe-clickhouse]

LGTM, thanks!