feat: add GitHub provider documentation and CIS v1.0.0 compliance

[HugoPBrito]

Context

As we are adding a new provider we need to ad its compliance.

Description

Added the CIS benchmark v1.0.0 compliance to Prowler.

Checklist

• Are there new checks included in this PR? No.
• 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.

[HugoPBrito]

Still pending to add README.md changes to reflect the final status of the GitHub provider release, like the number of checks, services, etc.