Implement `channel.moderate` v2

[pajlada]

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

Problem/Feature

Implement channel.moderate v2 EventSub topic

Description of Changes:

todo: describe usage of new flag todo: implement more actions

Checklist

• [x] My code follows the Contribution Guide
• [x] I have self-reviewed the changes being requested
• [x] I have made comments on pieces of code that may be difficult to understand for other editors
• [x] I have updated the documentation (if applicable)