Allow searching for content in the editor navigation

Update `\Drupal\experience_builder\Controller\ApiContentControllers::list` to read a `search` query parameter and do a `LIKE` query on the `label` entity key.

If only we had QUERY!

But at least in this case, the querystring itself should be comparatively tiny, so ?search=hello%20world will do just fine 👍

Note: ApiContentControllers::list() may end up finding hundreds of matches. But the API response does not yet support pagination. Thoughts?

But the API response does not yet support pagination. Thoughts?

Technically it'd still be a subset of the default result without a query string. But I do think getting pagination is going to become important pretty soon

All the threads are resolved hence moving into review.

wim leers → credited larowlan → .