\Drupal\editor\Entity\Editor should use a LazyPluginCollection

Updated: Comment #N

Problem/Motivation

\Drupal\editor\Entity\Editor::__construct() always creates a new plugin instance, and then manually invokes a hook and alter.
This is not optimal and doesn't match the architecture of any of the other config entities that use plugins.

Proposed resolution

This logic should be encapsulated in a PluginBag. Try extending DefaultSinglePluginBag.
Blocks and Actions are also 1:1 relationships.

Remaining tasks

Write the patch

User interface changes

N/A

API changes

API Addition