add segmentio codec tests

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

codec/segmentio/proto/test.proto

@@ -0,0 +1,16 @@
+syntax = "proto3";
+
+package helloworld;
+
+service Test {
+	rpc Call(Request) returns (Response) {}
+}
+
+message Request {
+  string uuid = 1;
+	string name = 2;
+}
+
+message Response {
+	string msg = 1;
+}