events server rewrite

[showierdata9978]

this is a rewrite of the events server in go and the necessary python things for it. right now, this pr isn't ready to merge

todos:

• MeowID migrator for objects that have events
• Post Event (90%)
• chat event
• userlist (not implemented in cl3-rewrite)
• create user
• update user
• delete user
• update user settings
• revoke session
• update relationship
• create chat
• update chat
• delete chat
• add chat member
• update chat member
• remove chat member
• create emote
• update emote
• delete emote
• typing
• update post
• delete post
• bulk post deletion
• add reaction
• remove reaction

[tnix100]

We do need to make sure when serving objects that have a new MeowID, replace _id/uuid with the object's MeowID.

We also need to archive old UUID4s and provide an API endpoint to exchange UUID4s for MeowIDs.

EDIT: And allow for fetching object's by both their old UUID4 and MeowID.