flatkv cache

[cody-littley]

Describe your changes and provide context

Add a caching layer to FlatKV, more than doubling performance in cryptosim benchmarks.

Testing performed to validate your change

Unit tests, ran benchmark over several days.

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Mar 17, 2026, 8:17 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.38%. Comparing base (3a6e71d) to head (0702197).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3027      +/-   ##
==========================================
- Coverage   58.39%   58.38%   -0.01%     
==========================================
  Files        2088     2087       -1     
  Lines      171939   171735     -204     
==========================================
- Hits       100401   100275     -126     
+ Misses      62588    62535      -53     
+ Partials     8950     8925      -25     

Flag	Coverage Δ
sei-db	70.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
app/app.go	71.41% <ø> (+2.08%)	⬆️
precompiles/addr/setup.go	89.47% <ø> (ø)
precompiles/bank/setup.go	89.47% <ø> (ø)
precompiles/distribution/setup.go	87.50% <ø> (ø)
precompiles/gov/setup.go	87.50% <ø> (ø)
precompiles/ibc/setup.go	88.88% <ø> (ø)
precompiles/json/setup.go	87.50% <ø> (ø)
precompiles/oracle/setup.go	88.88% <ø> (ø)
precompiles/p256/setup.go	80.00% <ø> (ø)
precompiles/pointer/setup.go	88.88% <ø> (ø)
... and 17 more

... and 1 file with indirect coverage changes

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