Introduce LifecycleCoroutineScopeFactory

[RBusarow]

If using LifecycleCoroutineScope but not using the lifecycleScope extension, the current best option for providing a custom scope/context via DI like Dagger may look like this:

class SomeFragment @Inject constructor(
  coroutineScope: MainImmediateCoroutineScope
) : Fragment() {

  private val lifecycleScope = LifecycleCoroutineScope(this, coroutineScope)

  // ...
}

This isn't terrible, since everything important is in the injected scope, but it can be improved.

class SomeFragment @Inject constructor(
  lifecycleCoroutineScopeFactory: LifecycleCoroutineScopeFactory
) : Fragment() {

  private val lifecycleScope = lifecycleCoroutineScopeFactory.create(this)

  // ...
}