Feature: Generic typed Loader/Renderer interface

[tylermmorton]

In the current version of the torque API, Loader and Renderer simply use the any type to describe the loader data.

type Loader interface {
    Load(req *http.Request) (any, error)
}

type Renderer interface {
    Render(wr http.ResponseWriter, req *http.Request, loaderData any) error
}

It would be great for API ergonomics to be able to declare them using a generic combination interface:

Illustration:

type GenericRenderer[T any] interface {
    Load(req *http.Request) (T, error)
    Render(wr http.ResponseWriter, req *http.Request, loaderData T) error
}

Rough outline of solution:

• [ ] Implement new generic interface type from above in module.go.
• [ ] Update handleLoader and handleRenderer in server.go to support the new interface type. This may or may not be possible with the generic type.
• [ ] Add documentation to the docsite and provide guidance on API usage.