Problem/Motivation
It would be great to provide URLs with UUIDs in their so you can link to them.
Proposed resolution
Add a new entity link format: /uuid/{entity_type}/{uuid}
To avoid content available on different URLs, UUID should redirect to canonical one, e.g. /uuid/node/68d0a104-a5bf-466c-a429-f871d91f9580 should redirect to /node/3.
Allow URIs like entity:node/68d0a104-a5bf-466c-a429-f871d91f9580
Add a new uuid link template for entities:
$node->toUrl('uuid');
Remaining tasks
User interface changes
API changes
None