Support Views

I tested the patch locally. Thanks for your contribution it's an indeed nice feature. It works well in general but unfortunately, it doesn't allow you to really switch to JSON content format. I investigated around and see that it's a little tricky and maybe even a challengeable as we first render view and later build custom_element from resulted HTML.
Maybe we need to research if there are any other possible solutions that allow keeping control of content format in one place in code and avoid major changes in architecture.

Additionally, I noticed that not only view rows were rendered into "rows" slot but also extra views wrapper tags. And as result we have outer rows slot and inner views-rows custom element. Maybe we can play with it to make the rendered content structure a little cleaner.
Example:

<view>
  <template #rows>
    <div class="views-element-container">
      <div class="view-id-test view-display-id-page_1">
        <div class="view-content">
          <views-rows>
            <template #row>
              <drupal-markup>
                <article role="article" class="node--view-mode-teaser">
                  ...
                </article>
              </drupal-markup>
              <drupal-markup>
                ...
              </drupal-markup>
              ...
            </template>
          </views-rows>
        </div>
      </div>
    </div>
  </template>
</view>

Replaced by https://www.drupal.org/project/lupus_decoupled/issues/3340520#comment-14... 📌 Views support Fixed