Fix EZP-21908: Implement Visibility Criterion visitor for Solr Storage

This PR resolves issue https://jira.ez.no/browse/EZP-21908

This implements indexing of Content visibility information and Visibility criterion visitor for Solr storage.
Implementation required Solr slots for hide/unhide Location operations. For this to work `$contentId` and `$currentVersionNo` are added to the corresponding signals.

Visibility information is indexed as multiple boolean field.

__Tests__
* integration tests
* integration regression tests (not enabled here as they still contain failures)