add linter, editorconfig and pre-commit hooks

[eliteprox]

This pull request introduces a standardized linting and formatting setup for the project. It adds configuration files for editor and linting tool consistency, and provides a custom Python script to run all linting checks in a unified way. These changes will help ensure code style consistency and catch common errors before code review.

Linting and Formatting Tooling:

• Added .editorconfig to enforce consistent indentation, line endings, and whitespace rules across editors and file types.
• Introduced .pre-commit-config.yaml to configure pre-commit hooks for tools like Black, isort, Ruff, and MyPy, automating code formatting, linting, and type checking.

Developer Workflow Improvements:

• Added a new lint.py script that runs all configured linting and formatting tools (Black, isort, Ruff, and MyPy) with clear output, making it easy for developers to check code quality locally.