Add new channel subscription types

[isabelcoolaf]

This PR adds support for these EventSub subscription types:

• channel.ad_break.begin
• channel.unban_request.create
• channel.unban_request.resolve
• channel.channel_points_automatic_reward_redemption.add
• channel.vip.add
• channel.vip.remove
• channel.warning.acknowledge
• channel.warning.send

This PR implements the rest of the new channel. EventSub subscription types. As I stated in my other PR, I left alone channel.moderate because there is already a pretty good PR for that one: #7

I fully tested each subscription type using the library on live Twitch, and the code also passes the "example" tests. It will work exactly how you expect it to.

Please let me know if there are any concerns and I will address them promptly. Thanks :)