MutableConfigProvider
Specifies a custom config provider to be used by ConfigHandler. Functions with this annotation should take in one argument (the value to generate a config for) and return a ConfigVariable. They should also be static (In Kotlin, this means using JvmStatic, a companion object, or a top-level function).
Parameters
priority
The priority of this provider. This helps with multiple providers for one class, where the provider with the highest priority will be selected.