Plugin hot reload

[Terminay]

Is your feature request related to a problem?
Yes. Whenever I update my plugin, the whole pipeline restarts for one small bug fix.

Describe the solution you'd like
Instead of restarting the whole pipeline, we could watch the plugin files and reload without restarting the pipeline.

Describe alternatives you've considered
None.

Which part of lessel does this affect?

• Core / pipeline
• Listener (Discord / WhatsApp / Slack)
• Sender
• Plugin system
• CLI
• Documentation
• Other

Additional context
Plugin Enhancement.