Create a Management API to extract binary fulltext

Currently if a customer has fulltext extraction disabled and they decide later on that they want to enable it, there is no way to do the fulltext extraction on documents (blobs) already in the db. Requesting for a fulltext bulk action to allow this.

This ticket introduce a new management API endpoint visit the doc page for more information:
https://doc.nuxeo.com/rest-api/1/fulltext-endpoint/

Note that there used to be a plugin to do that https://github.com/nuxeo/nuxeo-reindex-fulltext/tree/master (repo is now marked as deprecated)
but it will much better to create a bulk action that just run the FulltextExtractorWork inside the computation thread.