Twitch EventSub - Filter duplicate messages by id and timestamp

Handle duplicate events: https://dev.twitch.tv/docs/eventsub/#handling-duplicate-events

Guard against replay attacks: https://dev.twitch.tv/docs/eventsub/#guarding-against-replay-attacks

Add a new Twitch EventSub workflow callback to verify the message id and timestamp. The callback will be implemented in the Twitch EventSub Service to test messages received in different websocket sessions.