Arrow: Async#mapEffect

[pakoito]

fun <A, B> Kind<F, A>.mapEffect(f: suspend (A) -> B): Kind<F, B> =
  flatMap { a -> effect { f(a) } }

• [ ] Add function to Async.kt
• [ ] Add dokka on top of the function (see other functions on the file)
• [ ] Add examples below https://arrow-kt.io/docs/effects/async/#continueon

[FireZenk]

Let me do this one