Add receipt / log reads to cryptosim

[jewei1997]

Describe your changes and provide context

This PR extends the cryptosim receipt benchmark from a write-only workload into a mixed read/write workload that exercises the production receipt store path more realistically. It adds concurrent receipt readers to RecieptStoreSimulator, uses deterministic synthetic tx hashes so readers can reconstruct lookup targets without storing per-tx state, and simulates both receipt-by-hash queries and eth_getLogs-style log filter reads with a configurable recency bias toward newer blocks.

To make that workload measurable, the PR adds receipt read metrics and dashboard panels for read latency, reads/sec, cache hit vs miss rate, found vs not found results, and log filter latency. It also adds an optional receipt read observer so cache hits/misses are recorded at the ledger-cache layer, updates the parquet receipt store to return ErrNotFound cleanly when there is no legacy KV fallback, and refreshes the sample receipt-store config to enable the new benchmark mode. Overall, this gives us a better way to evaluate receipt-store behavior under concurrent reads, writes, cache pressure, and pruning.

Testing performed to validate your change

Ran go test ./sei-db/ledger_db/receipt/...
Ran go test ./sei-db/state_db/bench/cryptosim/...
Added unit coverage for deterministic SyntheticTxHash generation
Added unit coverage for receipt cache hit/miss observer reporting

[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	Apr 8, 2026, 11:58 PM

[codecov]

Codecov Report

❌ Patch coverage is 69.35484% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.03%. Comparing base (289bc61) to head (7655181).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-db/ledger_db/receipt/cached_receipt_store.go	62.79%	13 Missing and 3 partials ⚠️
sei-db/ledger_db/receipt/parquet_store.go	33.33%	2 Missing ⚠️
sei-db/ledger_db/parquet/store.go	85.71%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3081   +/-   ##
=======================================
  Coverage   59.02%   59.03%           
=======================================
  Files        2065     2065           
  Lines      169349   169405   +56     
=======================================
+ Hits        99960   100005   +45     
- Misses      60630    60641   +11     
  Partials     8759     8759           

Flag	Coverage Δ
sei-chain-pr	75.85% <69.35%> (?)
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
sei-db/config/receipt_config.go	76.19% <100.00%> (+0.58%)	⬆️
sei-db/ledger_db/parquet/reader.go	78.33% <100.00%> (+1.48%)	⬆️
sei-db/ledger_db/parquet/wal.go	76.11% <100.00%> (+0.73%)	⬆️
sei-db/ledger_db/receipt/receipt_store.go	74.74% <100.00%> (+0.25%)	⬆️
sei-db/ledger_db/parquet/store.go	68.91% <85.71%> (+0.46%)	⬆️
sei-db/ledger_db/receipt/parquet_store.go	68.16% <33.33%> (+0.74%)	⬆️
sei-db/ledger_db/receipt/cached_receipt_store.go	85.97% <62.79%> (-8.34%)	⬇️

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[cody-littley]

Nit, godocs are nice for exported functions

[cody-littley]

If it would be useful to be able to intercept this information for the cache, we should discuss potential API. Doesn't sound like a very tricky feature to add.

[cody-littley]

Potential hotspot, consider using canned random. (rand.Rand appears in a bunch of places in this file, comment applies to all use sites)

[cody-littley]

Note that if there are rand.Rand features you'd like to have that aren't in canned random, it should be fairly straight forward to add additional convenience methods to canned random that return whatever data type is convenient.