move auto saves from main thread to off thread

[Boomer-1]

❗ Checklist

• [X] I am using the official english version of Slimefun and did not modify the jar.
• [X] I am using an up to date "DEV" (not "RC") version of Slimefun.
• [X] I am aware that issues related to Slimefun addons need to be reported on their bug trackers and not here.
• [X] I searched for similar open issues and could not find an existing bug report on this.

📍 Description

See the discord thread below

https://discord.com/channels/565557184348422174/565569196218384385/1203819747687268403

and walshy's notes

https://discord.com/channels/565557184348422174/565569196218384385/1203820974470860893

📑 Reproduction Steps

review the spark report linked above

💡 Expected Behavior

moving save to off the main thread to reduce lag when saving

📷 Screenshots / Videos

No response

📜 Server Log

none

📂 /error-reports/ folder

none

💻 Server Software

Paper

🎮 Minecraft Version

1.20.x

⭐ Slimefun version

1133

🧭 Other plugins

No response