Add imports to their own threads. Add status indicators

What does this MR do and why?

___Describe in detail what your merge request does and why.___
Adds imports to own threads so Crafty can still operate while a server is being imported.

Implements issue https://gitlab.com/crafty-controller/crafty-4/-/issues/46

Screenshots or screen recordings

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• Have you checked this doesn't interfere/conflict/duplicate someone elses work?
• Have you fully tested your changes?
• Have you resolved any lint issues?
• Have you assigned a reviewer?
• Have you applied correct labels?