feat!: MediaItem refactor and use in Media Gallery

[sourcefilter]

Allows any supported media type to be used in a gallery.

BREAKING CHANGE: updated data format for MediaItem, will require gql changes

[github-actions[bot]]

🚀 Deployed on https://deploy-preview-231--ucla-library-storybook.netlify.app

[sourcefilter]

Relevant Stories: https://deploy-preview-231--ucla-library-storybook.netlify.app/?path=/story/global-media-item https://deploy-preview-231--ucla-library-storybook.netlify.app/?path=/story/flexible-media-gallery https://deploy-preview-231--ucla-library-storybook.netlify.app/?path=/story/media-gallery-banner-image https://deploy-preview-231--ucla-library-storybook.netlify.app/?path=/story/media-gallery-new-lightbox https://deploy-preview-231--ucla-library-storybook.netlify.app/?path=/story/media-gallery-thumbnail-card

Note that some of these stories include an audio file variant, which is not yet supported and so doesn't display properly

[pghorpade]

:tada: This PR is included in version 2.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: