chore: Embed unit test data (#1812)

* Embed unit test data

* Add testdata

Co-authored-by: anqiansong <anqiansong@bytedance.com>

tools/goctl/api/gogen/testdata/api_route_test.api

@@ -0,0 +1,16 @@
+type Request struct {
+    Name string `path:"name,options=you|me"`
+}
+type Response struct {
+    Message string `json:"message"`
+}
+service A-api {
+    @handler NormalHandler
+    get /greet/from/:name(Request) returns (Response)
+    @handler NoResponseHandler
+    get /greet/from/:sex(Request)
+    @handler NoRequestHandler
+    get /greet/from/request returns (Response)
+    @handler NoRequestNoResponseHandler
+    get /greet/from
+}