implement large bucket downloads

docker-compose.development.yml

docker-compose.yml

hyrax/Dockerfile

hyrax/app/controllers/download_all_controller.rb

hyrax/app/helpers/hyrax_helper.rb

hyrax/app/helpers/s3_storage_helper.rb

hyrax/app/jobs/hyrax/download_s3_bucket_job.rb

hyrax/app/models/concerns/external_services.rb

hyrax/app/services/s3_storage_service.rb

hyrax/app/views/hyrax/base/_download_all.html.erb

hyrax/config/initializers/mime_types.rb

hyrax/config/locales/en.yml

hyrax/config/locales/hyrax.en.yml