Feat/replace pipenv with poetry

[aarmoa]

• Replaced the use of Pipenv with Poetry to manage dependencies
• Added pre-commit as dependency and also as a validation done by GitHub for PRs
• Added Flake8 validations using FlakeHeaven (configured in pyproject.toml)
• Added Isort validations
• Added Black validations
• Added GitHub workflow to run all tests and calculate coverage.

The PR also fixes all issues found by the standards validation tools added in the PR

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