[IDEA] Add the grpc.health.v1.Health service to grpcbin

[spkane]

Is your feature request related to a problem? Please describe.
It would be really nice to be able to use grpc_health_probe against this out-of-the-box.

Describe the solution you'd like
I'd like to be able to spin this up in a cluster and then be able to immediately hit it with grpc-health-probe to determine if it is working as expected.

Describe alternatives you've considered
Nothing really. I am not super familiar with GRPC, but I know that this would be useful to me.

Additional context

grpc_health_probe  -addr 192.168.15.203:9000

error: this server does not implement the grpc health protocol (grpc.health.v1.Health): unknown service grpc.health.v1.Health