MetaRewriter

Rewrites the @Metadata proto alongside the bytecode. Sits ABOVE the ClassRemapper, so the proto handed down is already in the runtime namespace: ASM remaps an annotation's Type values and nothing else, and d1/d2 are plain strings it would pass straight through — which is what left kotlin-reflect resolving mojmap classifiers no non-mojmap runtime has, degrading to ??? or throwing with the name nowhere in the message.