Further consolidate the libraries

service/grpc/examples/greeter/function/proto/hello/hello.proto

@@ -0,0 +1,15 @@
+syntax = "proto3";
+
+package go.micro.srv.greeter;
+
+service Say {
+	rpc Hello(Request) returns (Response) {}
+}
+
+message Request {
+	string name = 1;
+}
+
+message Response {
+	string msg = 1;
+}