New Feature: Support for gRPC as protocol

[osoykan]

The applications that serve gRPC can be tested with Stove. We need a client from the testing point of view to achieve that.

A simple client would be when we want to invoke an action on a gRPC server.

protoc generated

val channel = ManagedChannelBuilder
    .forAddress("localhost", 50051)
    .usePlaintext()
    .build()

val stub = GreeterServiceGrpcKt.GreeterServiceCoroutineStub(channel)
val response = stub.sayHello(helloRequest { name = "World" })

Note: Wire generation might provide more flexibility over typed client usage.

Stove, dsl idea:

grpc {
 calling<GreeterService> {
  this.sayHello(Req("hi")) shouldBe Response("hello")
 }
}