Add Bundle to <drupal-media /> for Decoupled applications

As discussed on Slack, there are multiple ways to solve the issue.

1. Should the media module add the attribute to CkEditor?
2. Should the JSON API module allow fetching entities by just the entity type and UUID?
3. Should you use other core endpoints (or a custom endpoint) to fetch a media entity by UUID?

I'm not convinced the media module should add the attribute to work around a limitation of the JSON API module. So I would probably vote against solution 1. Loading an entity by entity type and UUID is very common and should probably also be supported by any frontend solution.

The JSON:API Cross Bundles → module might be able to help loading the media entity when the bundle is unknown, which could be a solution for 2?

Creating a new contrib module with a custom endpoint is always a possibility, but not sure if that is needed if the JSON:API Cross Bundles → module solves it?

For me, as the developer and user of DruxtJS, having the bundle information opens up the ability for the frontend to pre-filter the requested JSON:API data as well as apply Bundle specific templating, which if is of great benefit to the frontend developer.

While I could certainly load the entity without knowing the bundle, via a non-core solution, it negates the ability to be able to pre-filter the query based on the bundle information.

I have put together a repository to demonstrate the issue, and to be my sandbox while I work on a solution. You can check it out @ https://github.com/Decipher/druxt-experiments/tree/feature/drupal_media

The repo is setup to be run on Gitpod @ https://gitpod.io#github.com/Decipher/druxt-experiments/tree/feature/dru...

Currently I have the frontend transpiling the unprocessed text field (as Drupal Media doesn't allow you to disable the filter if the CKEditor plugin is in use) which renders the DrupalMedia component: https://github.com/Decipher/druxt-experiments/blob/feature/drupal_media/...

Re-rolled for 9.5.x

Re-roll for 10.1.0

Re-roll #6 for 10.1 + re-compiled drupalMedia.js