Responsive support (data-width)

Needs a reroll since 2 years have passed and the module changed a little bit.

Here is a new patch to apply to current 4.x version

Because the module has changed a bit, a new approach should be set:
- the result in $oembedResult = $source->getMetadata($media, 'html'); is no longer a #markup but a render array. Where '#is_iframe' is TRUE if someone uses the Oembed API, and FALSE if someone uses Embedded Posts.
- For the Oembed API, the current approach of string replace should be fine.
- For Embedded Posts, the $oembedResult is going to be a render array like this:

      $oembedResponse['html'] = [
        '#theme' => 'media_entity_facebook',
        '#url' => $resource_url,
        '#script_attributes' => $scriptAttributes,
        '#is_iframe' => $isIFrame,
        '#fb_sdk_langcode' => $fbLangcode,
      ];

      $oembedResponse['author_name'] = 'Facebook';
      $oembedResponse['width'] = '500';
      $oembedResponse['height'] = 'auto';
      $oembedResponse['url'] = $resource_url;
      return $oembedResponse;

The hardcoded width should be altered in FacebookEmbedFormatter::viewElements() in $oembedResult. And also, a new '#data-width' parameter should be added to the render array, to media_entity_facebook_theme() hook, and web/modules/contrib/media_entity_facebook/templates/media-entity-facebook.html.twig template so that the data-width value is rendered properly.