Some time along Solana mainnet-beta history,
the legacy data shred header was extended
from 86 bytes to 88 bytes.
We don't know when exactly this change has happened.
Or whether the shred version is self-describing.
For now, add a simple switch by slot number.
Updates blockstore dump YAML schema to reflect that
slices of shreds map to slices of entries.
Adds a new "entry_batches" wrapper list that annotates
each slice of entries with shred range and encoded size.