Atomic drain set

It would be cool to have an `BitSetLike` which supports `add_atomic` as `AtomicBItSet` do but also `drain_atomic` which will unset all set bits yield their ids.
Implementation should be similar to `AtomicBItSet` except of using `Ordering::Release` in `add_atomic`. While draining it should swap mask with `0` using `Ordering::Acquire` and move to the next level for each bit set (yield at lowest level).