(goctl): fix unresolved type if linked api imported (#3881)

tools/goctl/pkg/parser/api/parser/testdata/base/request.api

@@ -0,0 +1,6 @@
+syntax = "v1"
+
+type Baz {
+    Foo string `json:"foo"`
+    Baz bool `json:"bar"`
+}

tools/goctl/pkg/parser/api/parser/testdata/base/response.api

@@ -0,0 +1,10 @@
+syntax = "v1"
+
+import "request.api"
+type Bar {
+    Foo int `json:"foo"`
+    Bar bool `json:"bar"`
+    Baz
+    Qux map[string]string `json:"qux"`
+}
+

tools/goctl/pkg/parser/api/parser/testdata/link_import.api

@@ -0,0 +1,12 @@
+syntax = "v1"
+
+import "base/request.api"
+import "base/response.api"
+
+type Foo {}
+
+service demo {
+    @handler handlerName
+    get /users/id/:userId (Baz) returns (Bar)
+}
+