Create a more generic latest ami resolver
user
```ruby
module StackMaster
  module ParameterResolvers
    class LatestAmi < Resolver
      array_resolver class_name: 'LatestAmi'

      def initialize(config, stack_definition)
        @config = config
        @stack_definition = stack_definition
        @ami_finder = AmiFinder.new(@stack_definition.region)
      end

      def resolve(value)
        filters = @ami_finder.build_filters(value)
        @ami_finder.find_latest_ami(filters).try(:image_id)
      end
    end
  end
end
```
assistant