Add support for remapped resources.

[Decipher]

As a user of Contenta I need schema support for remapped resources.

Contenta remaps some of the resources by default, which causes issues with relationships as well as ensuring a valid schema.

The JSON API resource config has all the relevant information to resolve the issue.

This issue was started in https://github.com/Realityloop/druxt-schema/issues/6, but the functionality belongs here so it can be used by other modules.

https://www.drupal.org/project/drupal/issues/3105318

[Decipher]

There is a chance that the mapping will not be known from JSON:API Extras config. I'm working on adding the aliasing via code into Drupal core: https://www.drupal.org/project/drupal/issues/3105318

Originally posted by @mglaman in https://github.com/druxt/druxt-schema/issues/6#issuecomment-694486531

[Decipher]

Thanks @mglaman,

I'm open to manual overrides as well, as that was the original intent myself.

You can see the existing work done towards this here: https://github.com/druxt/druxt-router/blob/4e1983e4ee13164893ab1db898e35f245c4027ba/src/router.js#L223-L243

Take into account that this will not support a lot of usecases, but it's a starting point.

[Decipher]

Resources renamed using the JSON:API Extras module do work correctly, although there was a recent fix to the Druxt module for this that is still pending a version update: https://www.drupal.org/project/druxt/issues/3244770

However, resources renamed by the newly added renameResourceType method of the JSON:API Build event subscriber do not work as there's no central index to map the schema currently.