Add Folia basic support;

[HarvelsX]

Adds adapters for schedulers. Required for Bukkit and Folia schedulers. Created schedulers can be used in WorldGuard and in other plugins;

• [ ] Tested in detail

[Yomamaeatstoes]

When testing whether this project would build in Ubuntu I did encounter a build failure. I pasted it in mclogs https://mclo.gs/PXagKd8. When I tried building it in Terminal I did encounter this issue as well. I suppose they could be apart of the same issue https://mclo.gs/FGdD5KX

[octylFractal]

Yes, the new API must be accepted.