[Rpm-maint] [rpm-software-management/rpm] API improvement to accommodate for RPM CoW (PR#1470) (Discussion #2057)

[David Disseldorp]

@DemiMarie I wonder whether packaging fsverity (Merkle tree) metadata into the rpm header would be an option for performant block-based hashing. It'd also bloat the rpm header, but may have the benefit of allowing the metadata to be reused for post-installation integrity and authenticity protection (assuming the files remain read-only and reside on ext4/btrfs).
For my specific `BTRFS_IOC_ENCODED_WRITE` use case, I didn't intend to implement it as a plug-in, but as part of core. The implementation doesn't require modifications to the existing on-disk format, and the only FS specific behaviour is the actual encoded write ioctl calls.

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