Add a way to send params, headers, etc. w/ "API Only Usage"

[joshuap]

See API Only Usage. We should have a way to report request data manually like we do in our other clients (pseudo code):

reporter.reportError(t, {
  params: {
    foo: 'bar'
  }
});

See https://github.com/honeybadger-io/honeybadger-java/blob/731d80e0ea5eecca389db6026b814994ab41a471/src/main/java/io/honeybadger/reporter/dto/Request.java for available request data.

[JasonTrue]

I can start work on this if you like (probably Tuesday Japan time/Monday night for you).