Code quality improvements and tooling

[albertomontesg]

Given the request to improve the library to make it more reliable and ready for a 1.0 version, here is my contribution on that regard: #75

Added as standard tools:

• Black for python formatting
• Pylint for linting
• PyType for type checking

In addition, I consolidation all configuration for the Python package and the different toolings into the new pyproject.toml.

As code quality improvements:

• Updated .gitignore to be more exhaustive for python projects
• Annotated most of the code with python types
• Formatted the whole codebase given blacks formatting
• Remove unnecessary directories (that just holded a single module)
• Update methods, classes and attributes following best practices. This lead to PyLint rating to go from ~7 to 9.5+
• Make the Zone class a dataclass as it simplifies the init arguments and properties without that much code repetition
• Make the tests to use the unittest framework (that comes with Python standard library), so we have access to more readable assert methods.

[wmalgadey]

merged in a temporary branch to add workflows and fix conflicts. see #83

[wmalgadey]

I did some mess while fixing this PR, so I reopened it, until I can push the fixes again (Sorry for the troubles!)