[REQ] Improve go-gin-server template

Created by: ash-r1

Hi, I'm gopher, as others already mentioned, go-gin-server has several issues. I want to make points clear in this issue and discuss it.

Below is my suggestion as a gopher.

• Locate source codes on the root (instead of under go directory)
• Use separated package for controller or model.
• Controller's implementation which based on request/response definition.
  • Bind body with shouldBind or get parameter with getParam etc...
  • Return success/error with the corresponding HTTP status and response body.
• Defined routes with basic methods. Do not use the weird Route struct.
• (Advanced) Add controller struct and define action methods for struct pointers.
  • By using controller struct, it's easier to initialize middleware in server bootstrapping.

I have my custom generator to achieve these points on my local already. I can refine it and make a PullReq if someone needs it.

Is it should have the same name or another? go-gin-server2?

Please give me advice and opinion.

I think it's related to #1931 and #2752, #2803. But I filed this issue because these are somewhat outdated.