feat: suggest styles based on the file types in the project

[andreoliwa]

Issues fixed by this pull request:

• Fix #331

Proposed changes

1. Option --suggest on nitpick init, to scan project files and suggest styles based on file type (extension).
2. Option --fix to edit files in place.
3. New pre-commit hook nitpick-suggest.
4. Use the built-in styles by default but allow you to choose a custom directory with --library.
5. The names of options and TOML keys suggested in #331 were slightly modified; check the docs in this pull request.

Checklist

• [x] Read the contribution guidelines
• [x] Run make locally before pushing commits
• [x] Add tests for the relevant parts:
  • [x] API
  • [x] CLI
  • [x] flake8 plugin (normal mode)
  • [x] flake8 plugin (offline mode)
• [x] Write documentation when there's a new API or functionality

[coveralls]

Pull Request Test Coverage Report for Build 6845131875

• 208 of 212 (98.11%) changed or added relevant lines in 6 files are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.1%) to 95.981%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/nitpick/cli.py	50	54	92.59%
<!--	Total:	208	212	98.11%	-->

Files with Coverage Reduction	New Missed Lines	%
src/nitpick/cli.py	1	88.89%
src/nitpick/style.py	2	91.82%
<!--	Total:	3		-->

Totals
Change from base Build 6840572461:	-0.1%
Covered Lines:	2088
Relevant Lines:	2155

---

💛 - Coveralls

[github-actions[bot]]

:tada: This PR is included in version 0.35.0 :tada:

The release is available on:

• v0.35.0
• GitHub release

Your semantic-release bot :package::rocket: