Add new Tandy pattern

[mattboutet]

A call to /users/comments should get you all users with their comments.

[devinivy]

Would parameters on this route limit users or comments? One direction... would you consider integrating with objection-find, or otherwise supporting eager expressions? There are ways to limit which expressions are allowed too. https://github.com/Vincit/objection-find#special-parameters . The original bedwetter patterns are based directly on the GitHub API, which can be a good source of inspiration for questions like this.