wip: Introduces remember and builds stable eventHandlers on top of it.

[rjrjr]

No description provided.

[rjrjr]

Looking promising:

  override fun eventHandler(
    name: String,
    update: WorkflowAction<
      @UnsafeVariance PropsT,
      StateT,
      @UnsafeVariance OutputT
      >.Updater.() -> Unit
  ): () -> Unit {
    val handler = { actionSink.send(action("eventHandler:$name", update)) }
    return if (stableEventHandlers) {
      class Box0 {
        lateinit var delegate: () -> Unit
        fun fire() = delegate()
      }

      val box = remember("stableEventHandler:$name") { Box0() }
      box.delegate = handler
      box::fire
    } else {
      handler
    }
  }