Add instances for new `Servant.API.Range` type

[kutyel]

When this is merged, I have the code ready to have the ToSchema and ToParamSchema instances derived for free based on this code:

instance (KnownNat min, KnownNat max) => ToSchema (BoundedNat min max) where
  declareNamedSchema _ =
    pure . NamedSchema Nothing $
      mempty
        & #type ?~ OpenApiInteger
        & #minimum ?~ fromIntegral (minBound @(BoundedNat min max)).unBoundedNat
        & #maximum ?~ fromIntegral (maxBound @(BoundedNat min max)).unBoundedNat

instance (KnownNat min, KnownNat max) => ToParamSchema (BoundedNat min max) where
  toParamSchema = toSchema