[Feature Request] Enable in-browser usage of gRPC client

[Sushisource]

Is your feature request related to a problem? Please describe.

Some users have indicated interest in being able to use the gRPC client in the browser. Enable this.

Describe the solution you'd like

Solution probably will need to leverage https://github.com/grpc/grpc-web

Additional context

Client package needs to be free of deps on not-just-proto core code