Feature: Add Folia Support

[Quagington]

This change introduces a library called FoliaLib that allows this plugin to run on both Folia and Spigot/Paper. This library includes methods to replace scheduling calls.

Most of the changes in this PR are agnostic inline scheduler call replacements. However, for uses of BukkitRunnable a more intensive refactor was required as there is not an equivalent in Folia/FoliaLib.

[LOOHP]

I'm not sure if just replacing all the schedulers would work, as there isn't a main thread anymore. Some calls depend on or must be done on the main thread, so those ones might be a bit more difficult to get right on Folia.

[Quagington]

I'm not sure if just replacing all the schedulers would work, as there isn't a main thread anymore. Some calls depend on or must be done on the main thread, so those ones might be a bit more difficult to get right on Folia.

There still is the concept of a "Global" scheduler. For other things that would modify inventories, entities, etc. those would need to be done at a specific location and I tried to account for that in the PR. I recognize that there is heavy testing overhead with this PR and would be happy to assist however I can.

Many servers are moving to Folia and many plugins are adding support. Would love to help out but if not it's totally up to you. Cheers.