Add an AttachedRegistry for structure transformations

[ChiefArug]

Describe the Suggestion

Add an AttachedRegistry for transformations, so that mods can allow their blocks to be rotated on the X and Z axis without having to hard depend on Create (implement ITransformableBlock).

Screenshots and Videos

No response

Additional Context

Current usecase is for blocks registered with KubeJS, where you cannot create custom classes and can't mixin. However I do see use for this in other mods not wanting to hard depend on Create for compat.

[Lgmrszd]

Hmm, I might try to make a PR with that

Relevant issue (discussion): #5198

[ChiefArug]

Was this added? Or just closed as stale? (if closed as stale some indication of that would be nice, ie a github tag)