Optimize data cluster format for VHD and QCOW#6895

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last-genius wants to merge 6 commits intoxapi-project:26.1-lcmfrom

last-genius:asv/8.3-sparse-vhd-qcow

Commits on Feb 6, 2026

qcow-stream-tool: Switch read_headers to the interval-based sparse format
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vhd_format: Switch to sparse interval format for blocks_json
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vhd_qcow_parsing: Parse the new interval-based data_clusters format
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python3/qcow2-to-stdout: Implement Interval for checking sparse cluster allocation
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python3/qcow2-to-stdout: Switch to sparse interval format for nonzero_clusters
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xapi/qcow_tool_wrapper: Add note on using header information from VHD files
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