feat: add auth0-cli skill for managing Auth0 tenants and resources from the command line

[deepu105]

Add auth0 CLI to the skills. Update necessary docs.

Testing

NA

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not the default branch

[frederikprijck]

We already have #27, could you see if something is missing from that PR that you think we should add? Then we can consider adding it to #27.

Closing to not have two PRs for the same, thanks for the PR 🙏