SVM `bind_to_queue` and `unbind_queue` cannot be safely used

Since they modify the allocation in place, they're unusable e.g. in the array. Consider the expression `ary2 = ary.with_queue(None)`, which one might think should unbind underlying SVM from the queue. But `ary` is still ailve, and both `ary` and `ary2` refer to the same allocation.

Instead, we need some sort of "holder" object that inserts a queue into a list of queues that need to be synchronized with when freeing the SVM.

cc @matthiasdiener