Create file system based BlobSidecar data archive #8674
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PR Description
Follows on from #8640 to allow pruned BlobSidecars to be written to the file system as an archive.
Initial implementation requires a base path where BlobSidecars are written to a directory structure as
basePath/ab/cd/abcd... where the hex string of the block root starts with abcd. The slot and block root
are also written to index.dat in the basePath directory.
Fixed Issue(s)
partially address #8513
Documentation
doc-change-required
label to this PR if updates are required.Changelog