Update pre-commit configs

[Max Rakitin (mrakitin)]

This pull request introduces several updates to the project's configuration files, focusing on improving developer tooling and environment management. The most significant changes are the addition of Pixi environment configuration, updates to pre-commit hooks, and adjustments to .gitattributes for better handling of the pixi.lock file.

Development environment and tooling improvements:

• Added Pixi environment configuration to pyproject.toml, specifying Conda channels, platforms, editable install for the main package, multiple environments (default, dev, docs, test), and a development dependency on pre-commit.
• Updated .gitattributes to treat pixi.lock as a binary file, enable SCM syntax highlighting, and prevent 3-way merges, ensuring correct handling by Git and linguist.

Pre-commit hook and CI updates:

• Upgraded versions of several pre-commit hooks in .pre-commit-config.yaml, including blacken-docs, pre-commit-hooks, ruff-pre-commit, codespell, shellcheck-py, validate-pyproject, and check-jsonschema, to improve code quality checks and maintain compatibility with latest tooling. [1] [2] [3] [4]

[Max Rakitin (mrakitin)]

This will be handled via #28.