Request Models With Generic Params 🔥
## Examples
```nim
# this model will support JSON, XML, Form-Data and x-www-formurlencoded
model PureModel:
  id: int

# this model will support only JSON and XML
model JustJsonAndXml{JSON, XML}:
  id: int

# this model with generics supports JSON
model User{JSON}[T: int | int32 | int64]:
  id: T
```