Use Enum types as route params

[amitaibu]

We need to use Text and decode it in the action. We want to be able to define:

data PostController
    = PostController { someEnumType :: !SomeEnumType}

[s0kil]

@mpscholten Is this even possible? Not sure if we can check if our custom Enum types are an instance of Enum type class in the routing code.

[mpscholten]

I don't have any ideas how this can be implemented right now, but I assume there's a way to get this working

[amitaibu]

Maybe enumParamReader can help us here?

https://github.com/digitallyinduced/ihp/blob/a95e837e0aca4b80579a7dfeff84800ea0dc9123/IHP/Controller/Param.hs#L556-L566