apigateway: include targetUrl in output

[evans]

TODO:

• Update CHANGELOG.md* with your change (include reference to issue & this PR)
  - [ ] Make sure all of the significant new logic is covered by tests
• Rebase your changes on master so that they can be merged easily
• Make sure all tests and linter rules pass

*Make sure changelog entries note which project(s) has been affected. See older entries for examples on what this looks like.

Here's what it looks like:

[trevor-scheer]

LGTM!