Add endpoint to retrieve a canvas_page by UUID
>>> [!note] Migrated issue
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<!-- Migrated from issue #3582804. -->
Reported by: [attilatilman](https://www.drupal.org/user/3528404)
Related to !855
>>>
<p>The existing GET /canvas/api/v0/content/canvas_page/{id} endpoint requires the integer entity ID.</p>
<p>Add a new endpoint GET /canvas/api/v0/content/canvas_page/by-uuid/{uuid} that accepts the UUID and returns the same response as the existing GET endpoint.</p>
issue