Add support for taxonomy terms

Thanks @Turek, that looks great! I think a good idea for this module would be to support all core entities out of the box and leave others (e.g. Paragraphs, Commerce products etc.) to contrib.

So I'd absolutely vote for merging this into the module, once RTBC'd! :)

I created a MR from #2 for review!
Please mind that taxonomy terms are now also revisionable!

Drupal\Core\Entity\Query\QueryException: Entity queries must explicitly set whether the query should be access checked or not. See Drupal\Core\Entity\Query\QueryInterface::accessCheck()

Fixed that, please review!

Can we update for 2.0.x

Also will probably need some test coverage