Support any entity types (Taxonomy Terms, Contrib, ...)

Problem/Motivation

Drupal 8+ isn't Node-centered anymore, but entity-driven. It would be great, if this module could be extended to all entity types.
Maybe once it's ready a new module named "Entity keep" should be created to reflect this and this module could become deprecated.

In my case it would be very useful for taxonomy terms and commerce products!

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes