Expand supported EventSub status messages on related Endpoints

[Teekeks]

• [ ] https://dev.twitch.tv/docs/api/reference/#get-eventsub-subscriptions
• [ ] https://dev.twitch.tv/docs/api/reference/#get-conduit-shards
• [ ] https://dev.twitch.tv/docs/api/reference/#update-conduit-shards

[Teekeks]

Related to #290