[feat] Event/Message Bus/Queue-like processing for Server Log Events

Currently Server Log Events can be easily overwhelmed with Xenia, and timings can be inaccurate (e.g: instantly editing a message).

Xenia should use an event/message bus/queue like system for handling server log events to reduce the chance of clashes/spam happening.

Could implement it from scratch, or use a library like RabbitMQ. Just depends on performance and scalability.

No file or test is named. Start by locating the current Server Log Events handling in XeniaBot, then compare an in-process event bus with RabbitMQ for performance and scalability. Done means log events are processed without clashes or spam and their timings remain accurate.

Written by the indexing model from the issue text.