hpb/multi: properly split up internal.h based on backend #24224
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hpb/multi: properly split up internal.h based on backend
Before this delta, internal.h looked like it's backend-agnostic. It's not; it relied too heavily on upb internals. This CL sunders that illusion.
The extant internal.h has been moved to hpb/backend/upb, and a dummy c++ corollary has been created in hpb/backend/cpp.