feat(github): GitHub integration PoC

[HugoPBrito]

Context

Prowler aims to integrate GitHub as a provider to implement checks and ensure compliance standards are met.

Description

I've been working to mirror the structure used by other providers for GitHub, aiming to create a comprehensive PoC.

Checklist

• Are there new checks included in this PR? Yes / No
  • If so, do we need to update permissions for the provider? Please review this carefully.
• Review if the code is being covered by tests.
• Review if code is being documented following this specification https://github.com/google/styleguide/blob/gh-pages/pyguide.md#38-comments-and-docstrings
• Review if backport is needed.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 24 lines in your changes missing coverage. Please review.

Project coverage is 89.82%. Comparing base (a5f5967) to head (b815eeb).

Files with missing lines	Patch %	Lines
prowler/lib/outputs/finding.py	0.00%	7 Missing ⚠️
prowler/lib/outputs/html/html.py	28.57%	5 Missing ⚠️
prowler/__main__.py	0.00%	3 Missing ⚠️
prowler/lib/check/models.py	62.50%	3 Missing ⚠️
prowler/lib/outputs/summary_table.py	0.00%	3 Missing ⚠️
prowler/providers/common/provider.py	0.00%	2 Missing ⚠️
prowler/lib/outputs/outputs.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5787      +/-   ##
==========================================
- Coverage   89.88%   89.82%   -0.06%     
==========================================
  Files        1133     1133              
  Lines       35313    35345      +32     
==========================================
+ Hits        31741    31750       +9     
- Misses       3572     3595      +23     

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[MrCloudSec]

1. Remove the flags that look into environment variables, and instead, if no flag is passed in the GitHub provider, look for any existing environment variable.
2. Enforce flags --github-app-key and --github-app-id to be present when any of them are passed.
3. Update print_credentials function with information for each type of authentication.
4. Add a test for each auth method in the provider.