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Add micro_bench_qcow_multi_cluster_read which issues large reads spanning 8 contiguous clusters (512 KiB) per read_vectored call. This exercises the mapping coalesce path where multiple L2 entries are merged into fewer host I/O operations. Workloads: 128 and 256 total clusters (16 and 32 reads). Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>