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Add micro_bench_qcow_cow_write which writes clusters into a QCOW2 overlay backed by a raw file. Each write triggers copy-on-write: cluster allocation, L2 and refcount table updates, then the data write. This measures COW allocation overhead compared to writing into a plain empty image. Workloads: 128 and 256 clusters. Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>