EXP: open up the RocksDB to playing about

[ctb]

Needed for https://github.com/ctb/2025-explore_sourmash_rocksdb

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.27%. Comparing base (29aa2db) to head (d99caad).

Additional details and impacted files

@@           Coverage Diff           @@
##           latest    #3468   +/-   ##
=======================================
  Coverage   86.27%   86.27%           
=======================================
  Files         137      137           
  Lines       16226    16226           
  Branches     2225     2225           
=======================================
  Hits        13999    13999           
  Misses       1914     1914           
  Partials      313      313           

Flag	Coverage Δ
hypothesis-py	25.43% <ø> (ø)
python	92.32% <ø> (ø)
rust	62.37% <ø> (ø)

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