WL-3618 Improve logging relating to content review.

We aren’t logging stack traces and it’s a little difficult to track down which records are causing messages in the logs so we log details about the current submissions and include it’s DB ID rather than the object ID. We use toString() rather than this as it’s clearer what’s happening and IDEs allow you to easily jump to the declaration to see what should be in the output.
Merge pull request #12 from ox-it/WL-3618

WL-3618 Improve logging relating to content review.