Information dense entity dumper

[chx]

Now that we can load entities fast, we should have useful information after loading them.

This PR

1. Shows the field types
2. Shows how many values currently there are if more than one
3. Shows as much information as possible on a single line. See the hide_translation field below for a demo of the first three.
4. Shows entity references with an executable snippet: User::load(123) shows a reference to user 123. It's very easy to load it, this way. Yes, Paragraph::loadRevision() is not a thing yet but just wait. It still tells the story in a very compact way. It doesn't do this for config entities to avoid NodeType::load() for node types. Perhaps it could for config entities which do not have a bundleOf annotation. Alas, this PR is written with one particular consumer in mind (me) and I didn't need this one. There's always the next PR.

[weitzman]

LGTM. Just one feedback.