chore: Configure coding style

[khwilo]

Description

Set up pre-commit hooks for a consistent coding style across the whole project.

Tasks

• [x] Installed the following packages: black, flake8, isort, pre-commit
• [x] Created a pre-commit configuration file
• [x] Defined rules for black, isort, and flake8 on the setup.cfg file
• [x] Installed pre-commit git hooks: pre-commit install

The pre-commit hook will run on every commit to confirm if the defined coding style is followed. An attempt to format the files is done in case of any inconsistency.