What's New:

ExtraCodecs

This port removes fromJsonSerializer and other JsonSerializer related methods, as JsonSerializer is no longer a thing.

Removed TagManager and LootDataManager types, as those were moved to dynamic registries.

Removed SavedDataHelper, as SavedData was refactored into using datafixerupper codecs, making this class obsolete.

Additionally, Fabric provides a data attachment API, which is a (better) replacement for those classes.