Add support to serialize qtensor in JIT. (#23356)
Summary:
Adds qtensor specific fields to the proto file so that they get serialized into the model.json
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23356
ghstack-source-id: 87263428
Differential Revision: D16473237
fbshipit-source-id: bf5b51d0863d036d30a1644a3c3b74516468224b
