Cookiebot support

This is the patch. I know it is not to be comitted to the module this way, but for reference if someone needs it.

There's a cookie consent solution for this module I made for the COOKiES modules: https://www.drupal.org/project/cookies_media_entity_facebook →
There I basically modify the script tag this way:

/**
 * Implements hook_preprocess_HOOK().
 */
function cookies_media_entity_facebook_preprocess_media_entity_facebook(&$variables) {
  $variables['script_attributes']['data-sid'] = ['facebook'];
  $variables['script_attributes']['type'] = ['text/plain'];
}

I think a similair approach would be better to set the data-cookieconsent="marketing". Another question would be that since every cookie consent solution does things differently, should we commit to this repo as a submodule, or should we create separate module for that, or should we create a MR to include that to the Cookiebot module instead?

Thanx @kaszarobert. Ik think you have a fair point here. Thinking about it, a hook like yours could be added to the module, only we don't use the module but it is integrated via google tag manager. So than we should incorporate it in a custom submodule for ourselves I think.