use 'gf gen ctrl' to support“type()”

[whileW]

gf gen ctrl 是否可以支持一下，下面这种语法
同一个api的req和res用type括起来是不是更清晰一点？

type (
	CreateReq struct {
		g.Meta `path:"/administrator/v1/create" method:"post" tags:"AdministratorService" summary:"Create a new administrator"`
	}
	CreateRes struct{}
)

[github-actions]

Hello @whileW. We like your proposal/feedback and would appreciate a contribution via a Pull Request by you or another community member. We thank you in advance for your contribution and are looking forward to reviewing it!
你好 @whileW。我们喜欢您的提案/反馈，并希望您或其他社区成员通过拉取请求做出贡献。我们提前感谢您的贡献，并期待对其进行审查。