ExecuteFor

In `RedSynchronizer`:

We currently support only `execute` which receive a `PendingMarker` to mark completion of execution.
We should also support

- `executeForFuture` which returns a `Future`
- `executeForListenableFuture` which return `ListenableFuture`
- `executeForRedFuture` which return `RedFuture`
- `executeForCustom`