feat(queue): add new_boxed constructor and detach_unused method - #10
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- Add `new_boxed<T>` constructor that allocates VirtQueue directly on the heap, avoiding large stack allocations for queues with substantial descriptor shadow arrays (requires `alloc` feature). - Add `detach_unused` method to recycle a descriptor chain during driver teardown after the device has been reset. Signed-off-by: LoGin <longjin@DragonOS.org>
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Summary
new_boxed<T>constructor: AllocatesVirtQueuedirectly on the heap, avoiding large stack allocations for queues with substantial descriptor shadow arrays (requiresallocfeature).detach_unusedmethod: Recycles a descriptor chain during driver teardown after the device has been reset and can no longer access the queue.