"Token Authorization" for gRPC

[udaij12]

🚀 The feature

Current token authorization is being developed for HTTP (https://github.com/pytorch/serve/pull/3163). Future development should be included to add this feature to support gRPC as well.

Motivation, pitch

Currently gRPC ports are bound to local host however if user decided to open those ports we would like to add this feature for those cases.

Alternatives

No response

Additional context

No response