Async chunk loading for spawning and respawning

[qbasty]

Is your feature request related to a problem? Please describe. I'm experiencing a lot of lag due to spawning and respawning as my spawn region is pretty big

Describe the solution you'd like Async chunk loading when a player spawns/respawns

Describe alternatives you've considered I'm loading that area all the time with paper.yml keep-spawn-loaded but that causes too many chunks to be loaded