Add compatibility with JSON:API

This will conflict with the main idea of this module, to be as simple as possible and benefit from returning the result as fast as possible without doing any additional entity loads from the database. Most of the time the results will come directly from the search server response without additional changes. So maybe it is better idea to help jsonapi_search_api to have facets (I have already seen, that there is some work done) and autocomplete integration

There is an event SearchApiEndpointResultsAlter called for each search result item that can be used to alter the output in the way that is needed and also add more fields, etc. At the moment the event is missing the current request variable, but this can be added. Actually it makes sense to have it in alter event.

Closing this issue, because it will not be implemented in this module.