Introduce ability to pick specific fighters for battles

In the super heroes UI, introduce the ability to pick a specific hero and/or villain for a battle, rather than selecting random ones.

Maybe a pop-up that hits the heroes & villains services directly? This would also be a good thing where in the future we could introduce an API management layer so that the UI only talks to that and not the individual services directly.

There would probably need to be some discussion on the UI and the flow. That discussion can happen here in this issue.

Additionally - the same way the UI handles the URL to the fight service would have to work here as well for the UI to talk to both the heroes & villains services.