add `.pre-commit-config` and formatting rules

[9y2070m]

I just wanted to create a pytest-plugin.

When using the cookiecutter-pytest-plugin I realized that some IHMO essentials are missing.

Before you get a pull request, I'd like to discuss what to add.

• ruff (similar configuration as pytest itself)
• pyproject-fmt
• pyupgrade
• py-deprecated
• mypy

We could also extend the .gitignore with the common IDE project files.

• .idea
• .project
• .settings
• .vscode