Problem/Motivation
SDC components have a group property: https://api.drupal.org/api/drupal/core%21modules%21sdc%21src%21Component...
But it doesn't seem this property is leveraged until now.
Proposed resolution
Implement CategorizingPluginManagerInterface in ComponentPluginManager:
It may not be possible to use CategorizingPluginManagerTrait because the property is group instead of category.
User interface changes
No. Some contrib modules can leverage the added methods to build UI widgets, but nothing will happen in Core in the scope of this ticket.
API changes
Only additions, so not breaking.
Release notes snippet
"ComponentPluginManager is implementing CategorizingPluginManagerInterface"