Dry-transformer with dynamic options

Support
4

I’m sure this is not the right way to do it, but with some hacking I managed to make it “work”.
My branch is here

# My class
      def my_keys
        @rename_keys
      end

      define! do
        map_array do
          rename_keys(&:my_keys)
        end
      end

# lib/dry/transformer/hash.rb
      def self.rename_keys(source_hash, mapping)
        Hash[source_hash].tap do |hash|
          # mapping.each { |k, v| hash[v] = hash.delete(k) if hash.key?(k) }
          mapping.fn.call.each { |k, v| hash[v] = hash.delete(k) if hash.key?(k) }
        end
      end

Yep, its a very ugly hack that will probably break. Will keep investigating the proper way of doing this later today.

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