Experimental CLI interface (alpha version)

[andreoliwa]

Suggested Feature

Run Nitpick as a CLI command instead of being dependent on flake8.
Paving the way to #260.

$ poetry run nitpick --help
Usage: nitpick [OPTIONS]

  Enforce the same configuration across multiple projects.

Options:
  -p, --project DIRECTORY  Path to project root
  --offline                Offline mode: no style will be downloaded (no HTTP
                           requests at all)

  -c, --check              Don't modify the configuration files, just print
                           the difference. Return code 0 means nothing would
                           change. Return code 1 means some files would be
                           modified.

  -v, --verbose            Verbose logging
  --help                   Show this message and exit.

Context

⚠️ This is an experimental version. ⚠️

It's still a work in progress:

• Not completely covered by tests;
• Not documented.
• Related to CLI: Remove flake8 dependency, run with pre-commit #166, but it does not address all the bullet points there.

After an extensive internal refactoring, this first version is functional.
The CLI output has to be adjusted, it's not guaranteed to work yet... but it's a decent start.

[github-actions]

🎉 This PR is included in version 0.24.0 🎉

The release is available on:

• v0.24.0
• GitHub release

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