💡 Catch up to missed events after rebooting

[MarcusOtter]

Describe the improvement

During deployments, Needle will go down and miss some events and messages. When Needle boots back up, it should check for these and see if there's anything it can catch up to. For example, find messages in auto-thread channels that are without a thread (and should be without a thread, if #93 is implemented)

Problems this improvement solves

Updating the bot won't be as bad for everyone using it. Missed threads in auto-thread channels are no fun.

Alternative solutions

• Make it possible to update Needle without downtime. If you know how to do that in an easy way, let me know! Everything I can think of requires quite a bit of work and system architecture...