Add token for most recent entity revision

Problem/Motivation

In a project I needed to display, using tokens, the most recent revision's data in a message. Since there is a moderation though, the data retrieved by the tokens were the latest active revision's and not the most recent's one.

Proposed resolution

Provide a new [node:latest-revision:*] token which will act (a) for all revisionable entity types and (b) like [node:*] but for the latest revision.

Existing issues

There are already a few issues related but for earlier versions of this module: #252241: Add tokens for node revision timestamp, author, and log message and #992646: Add a 'node revision' token type.