It is very expensive to instantiate targets. We should have an ability to instantiate a target when necessary, for example when selecting the target. For this purpose we need a select api

It might look something like the resource actor api: https://phabricator.services.mozilla.com/D4336

But it should be more light weight. The type signature of the function might look like this (pseudo flow code). It should return a fully instantiated target front

type TargetDescriptor = {
  url: String,
  ...
}


function select(descriptor: TargetDescriptor) : TargetFront {}

Closing this as this pattern is solved by the descriptor's getTarget function