Public interface for Lookback Participate, the friendly UX for guiding test particioants
through a research session, be it live, self-guided or in person.
By setting up Participate for your app, you prepare your app for receiving "Participate URLs",
and allows it to be used in UX research. Participate is a UI layer on top of of the `LookbackRecorder`,
so that Lookback can take care of the full research flow for you.
The Participate flow is completely self contained, so once implemented, you do not need to
use the `LookbackRecorder` or any other SDK API.