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	Mar 23, 2026, 9:39 PM

[codecov]

Codecov Report

❌ Patch coverage is 54.28571% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.56%. Comparing base (491d2c6) to head (7b8ccba).

Files with missing lines	Patch %	Lines
sei-db/ledger_db/receipt/cached_receipt_store.go	53.33%	12 Missing and 2 partials ⚠️
sei-db/ledger_db/receipt/parquet_store.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3081      +/-   ##
==========================================
+ Coverage   58.33%   58.56%   +0.22%     
==========================================
  Files        2096     2096              
  Lines      173400   173402       +2     
==========================================
+ Hits       101149   101548     +399     
+ Misses      63194    62800     -394     
+ Partials     9057     9054       -3     

Flag	Coverage Δ
sei-chain-pr	74.23% <54.28%> (?)
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/ledger_db/receipt/receipt_store.go	74.74% <100.00%> (+0.25%)	⬆️
sei-db/ledger_db/receipt/parquet_store.go	66.91% <0.00%> (-0.51%)	⬇️
sei-db/ledger_db/receipt/cached_receipt_store.go	85.61% <53.33%> (-8.41%)	⬇️

... and 39 files with indirect coverage changes

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