feat: add gRPC server configuration and initial implementation with example proto

protos/example.proto

@@ -0,0 +1,23 @@
+syntax = "proto3";
+
+option go_package = "proto/greeter";
+option php_namespace = "GRPC\\Greeter";
+option php_metadata_namespace = "GRPC\\GPBMetadata";
+
+package helloworld;
+
+// The greeting service definition.
+service Greeter {
+  // Sends a greeting
+  rpc SayHello (HelloRequest) returns (HelloReply) {}
+}
+
+// The request message containing the user's name.
+message HelloRequest {
+  string name = 1;
+}
+
+// The response message containing the greetings
+message HelloReply {
+  string message = 1;
+}