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Add micro_bench_qcow_write which times write_vectored calls through QcowSync on an empty QCOW2 image. Each write allocates a new cluster exercising map_cluster_for_write with L2 entry allocation and refcount updates followed by pwrite_all. Two TEST_LIST entries: micro_block_qcow_write_128_us and micro_block_qcow_write_256_us with 128 and 256 cluster workloads. Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>