introduce scoped registry holder using PhaseTracker

[Faithcaio]

SpongeAPI | Sponge

Adds RegistryKey#asScopedReference
and RegistryType#asScopedType
which uses the current Cause to determine an appropiate RegistryHolder
if none is found it falls back to Server if available else to Game

This allows early access to registries available after Game but before Server.
E.g. EnchantmentTypes during registration for recipes.

[MrHell228]

Server DefaultedRegistryTypes should probably use scoped registry holder as well