Async task handling improvement

[HaHaWTH]

Closes #184 and #102.

Changes

• All threads are core thread in MultithreadedTracker and AsyncPathfinding, create new threads first instead of filling up the queue.
• Removed auto-resize option in async entity tracker, no longer needed.
• Schedule path consumer to Paper entity scheduler
• Discard pathfinding tasks submitted later if we already have a task in the queue.

Great thanks to @Taiyou06 and other contributors for the help

[Dreeam-qwq]

Jump!