Levi Tamasi fdc1cb43a6 Support decoding blob indexes in sst_dump (#5926)
Summary:
The patch adds a new command line parameter --decode_blob_index to sst_dump.
If this switch is specified, sst_dump prints blob indexes in a human readable format,
printing the blob file number, offset, size, and expiration (if applicable) for blob
references, and the blob value (and expiration) for inlined blobs.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5926

Test Plan:
Used db_bench's BlobDB mode to generate SST files containing blob references with
and without expiration, as well as inlined blobs with and without expiration (note: the
latter are stored as plain values), and confirmed sst_dump correctly prints all four types
of records.

Differential Revision: D17939077

Pulled By: ltamasi

fbshipit-source-id: edc5f58fee94ba35f6699c6a042d5758f5b3963d
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