Add gRPC support

A few links can be helful
https://grpc.io/blog/state-of-grpc-web/
https://chromium.googlesource.com/external/github.com/grpc/grpc/+/v1.12.0/doc/PROTOCOL-WEB.md
https://docs.microsoft.com/en-us/aspnet/core/grpc/browser?view=aspnetcore-6.0
https://stackoverflow.com/questions/65823598/questions-about-grpc-support-in-web-browsers-and-how-they-utilize-http2