public GrpcServiceBuilder addServiceDefinitions(Iterable<ServerServiceDefinition> services) {
        requireNonNull(services, "services");
        services.forEach(this::addService);
        return this;
    }
Adds gRPC {@link ServerServiceDefinition}s to this {@link GrpcServiceBuilder}.
grpc/src/main/java/com/linecorp/armeria/server/grpc/GrpcServiceBuilder.java