Polish Behavior api

[He-Pin]

The current one may be nested; we can make use of a chained call.
eg:
https://smallrye.io/smallrye-mutiny/latest/

request.ifNoItem().after(ofMillis(100))
    .failWith(() -> new TooSlowException("💥"))
    .onFailure(IOException.class).recoverWithItem(fail -> "📦")
    .subscribe().with(
        item -> log("👍 " + item),
         err -> log(err.getMessage())
    );