Switch from grpc to @grpc/grpc-js

[merlinnot]

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

@grpc/grpc-js has multiple advantages over grpc. All Google libraries are now switching to @grpc/grpc-js. This is the only library left that I still see a dependency on grpc, which is use only in tests and as a source of type definitions.

Describe the solution you'd like

I'd like to see the dependency dropped and the source code to either use type definitions from google-gax or @grpc/grpc-js.

Describe alternatives you've considered

I don't see alternatives.

Additional context

Not applicable.

[sduskis]

Thanks for raising this issue. We used it at one point, and then reverted in #595. I'll follow up with @alexander-fenster and @bcoe to figure out timing of using grpc-js once again.

[sduskis]

@callmehiphop, would you be able to test out grpc-js with large messages (i.e. publish a 9MB message, and then subscribe and see the value)? If that works, then I think we can proceed with this. Otherwise, I think we need to create a bug for the grpc team.