Add pre-commit-hooks

[k9845]

Addresses

• Enforce flake8 linting #811

TODO For future PRs

• Add testing coverage indicator #812
• Add CONTRIBUTING.md  #810
  • Add CONTRIBUTING.md  #810 (comment)

Changes

• Introduce pre-commit tool to run locally and through CI
  • black
  • isort

WARNING

To enforce this checks we need to update the current code base using black and isort which will change almost all the codebase. We will need to do that changes after merging all the pending PRs to avoid conflicts.

[thenav56]

We will also need to update our pyproject.toml.
NOTE: Make sure extend-exclude/skip has same behavior as .pre-commit exclude

[tool.black]
line-length = 130
# NOTE: Update in .pre-commit-config.yaml as well
extend-exclude = "(__pycache__|.*snap_test_.*\\.py|.+\\/.+\\/migrations\\/.*)"

[tool.isort]
profile = "black"
multi_line_output = 3
# NOTE: Update in .pre-commit-config.yaml as well
skip = [
    "**/__pycache__",
    "**/snap_test_*.py",
    ".venv/",
    "legacy/",
    "**/migrations/*.py",
]

[k9845]

LGTM

[szabozoltan69]

Deployed to Staging and even to Prod also (with an other fix).