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cps-async-connect: integration of dotty-cps-async with effect stacks

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package cps.stream.akka

import scala.concurrent.*
import akka.NotUsed
import akka.stream.*
import akka.stream.scaladsl.*


import cps.*
import cps.monads.{*,given}
import cps.stream.{*,given}


given AkkaStreamEmitAbsorber[T](using ExecutionContext, Materializer):  BaseUnfoldCpsAsyncEmitAbsorber[Source[T,NotUsed],Future, FutureContext, T] with 

  override type Element = T

  def asSync(fs: Future[Source[T,NotUsed]]):Source[T,NotUsed] =
    Source.futureSource(fs).preMaterialize()._2

  def unfold[S](s0:S)(f:S => Future[Option[(T,S)]]): Source[T, NotUsed] =
        Source.unfoldAsync[S,T](s0)((s) => f(s).map(_.map{ case (x,y) => (y,x) }) )