Namespace drupalSettings setup.

Problem/Motivation

Currently this module is initializing its settings like this in the gdpr_video.module file:

      $page['#attached']['drupalSettings'] = [ ... ];

The problem is if this module loads after another module that's also using Drupal settings, it will wipe out that module's settings. In my case it was breaking the ajax_loader module.

Proposed resolution

Easiest fix is to just write all this module's settings under a "gdprVideo" key in the settings so that it doesn't affect any other modules. That's what the attached patch does.