Feature/add tox and fix pep8 errors

[adrianfusco]

Hello. I've used the generator and it's great :).

I'd like to propose the following:

• Add this tox.ini file to run flake8 under the project. We can ensure at this way we're fulfilling PEP8 and avoid these kinds of errors:

  [2022-03-30 22:05:50] {afuscoar@afuscoar} (~/.Personal/Projects/mac) (master)$ -> tox
  pep8 installed: flake8==4.0.1,mccabe==0.6.1,pycodestyle==2.8.0,pyflakes==2.4.0
  pep8 run-test-pre: PYTHONHASHSEED='4139552014'
  pep8 run-test: commands[0] | flake8
  ./scripts/python_validator/mac_validate.py:67:80: E501 line too long (82 > 79 characters)
  ./scripts/python_validator/jsonschema_generator.py:27:80: E501 line too long (87 > 79 characters)
  ./scripts/python_validator/jsonschema_generator.py:6:1: F401 'jsonschema' imported but unused
  ERROR: InvocationError for command /home/afuscoar/.Personal/Projects/mac/.tox/pep8/bin/flake8 (exited with code 1)

• Add a workflow to run the pipeline with tox when there's a push or pull request.
• Fix the errors produced by PEP8

Let me know your opinion :). Thx.

[adrianfusco]

Hello @ydarias I can't add reviewers because I'm not a codeowner. I tag you here because I've seen you have approved anothers PRs.

Thanks!

[ydarias]

Hello @ydarias I can't add reviewers because I'm not a codeowner. I tag you here because I've seen you have approved anothers PRs.

Thanks!

Thank you very much for your contribution @adrianfusco :-)

I will approve and assign @dbonillaf to merge the PR ^_^

[dbonillaf]

Thanks @adrianfusco !!!