wip feat: add gorm generator when using cwgo model

[Skyenought]

trafficstars

What type of PR is this?

What this PR does / why we need it (en: English/zh: Chinese):

en: zh:

Which issue(s) this PR fixes:

https://github.com/cloudwego/cwgo/issues/219

[HeyJavaBean]

We are currently considering archiving the cwgo project, so we are temporarily not accepting new pull requests. If you explicitly wish to merge, please provide background and context.