Make Schema::Key representable
Make Schema::Key representable

It's not perfect but it's still better:

[1] pry(main)> Types::Hash.schema(foo: 'integer').key(:foo)
=> #<Dry::Types[foo: Nominal<Integer>]>

dryrb/dry-types,dryrb/dry-data,dryrb/dry-data,dryrb/dry-types