feat(goctl): better generate the api code of typescript (#2483)

tools/goctl/api/spec/example_test.go

@@ -0,0 +1,15 @@
+package spec_test
+
+import (
+	"fmt"
+	"github.com/zeromicro/go-zero/tools/goctl/api/spec"
+)
+
+func ExampleMember_GetEnumOptions() {
+	member := spec.Member{
+		Tag: `json:"foo,options=foo|bar|options|123"`,
+	}
+	fmt.Println(member.GetEnumOptions())
+	// Output:
+	// [foo bar options 123]
+}