Issue #3278003: Add sub-module for media-library templates

modules/uswds_blb_configuration_media_library/.gitignore

modules/uswds_blb_configuration_media_library/.sass-lint.yml

...b_configuration_media_library/css/theme/media-library.css

...s/uswds_blb_configuration_media_library/package-lock.json

modules/uswds_blb_configuration_media_library/package.json

...configuration_media_library/scss/theme/media-library.scss

...rary/templates/container--media-library-content.html.twig

...lates/container--media-library-widget-selection.html.twig

.../details--media-library-add-form-selected-media.html.twig

...ibrary/templates/fieldset--media-library-widget.html.twig

...y/templates/form--media-library-add-form-upload.html.twig

...tes/form--views-form-media-library-widget-image.html.twig

...s/form-element-label--edit-media-library-select.html.twig

...dia_library/templates/input--edit-media-library.html.twig

...es/item-list--media-library-add-form-media-list.html.twig

...dia_library/templates/links--media-library-menu.html.twig

...on_media_library/templates/media--media-library.html.twig

...dia_library/templates/media-library-item--small.html.twig

...tion_media_library/templates/media-library-item.html.twig

...n_media_library/templates/media-library-wrapper.html.twig