Add DecodeRepeatedProtoField as well as a counterpart to DecodeProtoField that extracts repeated fields in a serialized proto.
Add DecodeRepeatedProtoField as well as a counterpart to DecodeProtoField that extracts repeated fields in a serialized proto.

PiperOrigin-RevId: 422916369

tensorflow/lingvo,tensorflow/lingvo,tensorflow/lingvo,tensorflow/lingvo