add internal rpc file and LookUpName rpc

auth/v1/internal_srv.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package auth.v1;
+
+import "auth/v1/msg.proto";
+
+service InternalAuthorizationService {
+    rpc LookUpName(LookUpNameReq) returns (LookUpNameRes) {}
+}

auth/v1/msg.proto

@@ -220,4 +220,18 @@ enum OtpStateEnum {
   LOGIN = 1;
   INTERNAL_TRANSFER = 2;
   EXTERNAL_TRANSFER = 3;
+}
+
+message Recipient {
+  string id = 1;
+  optional string first_name = 2;
+  optional string last_name = 3;
+}
+
+message LookUpNameReq {
+  Recipient recipient = 1;
+}
+
+message LookUpNameRes {
+  Recipient recipient = 1;
 }