Add static file storage crate#85
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Standalone slot-indexed append-only file storage library. One StaticFile owns a directory of data_*, data_*.off, and column.conf files; durable on return for put / put_batch, with one fsync per underlying file in the batched path instead of per-slot. u64 slots, no consensus types - any caller (cold-DB freezer, lcli ERA importer) can depend on this without depending on store / beacon_chain. File format documented in the lib.rs header. Benches at benches/large_writes.rs target the performance-critical ERA-load write path: ~30 MB no-compression state-snapshot records. Four cases: put_single, put_batch_eight_in_one_file (no-compression and snappy variants), put_batch_32_cross_file.
This reverts commit 9a94d4a.
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Summary
Testing