add receipt generation to cryptosim

[jewei1997]

Describe your changes and provide context

• Add receipt generation to cryptosim: each simulated ERC20 transfer transaction now produces a realistic receipt with logs, bloom filter, gas fields, and tx type distribution
• Add a RecieptStoreSimulator that consumes generated receipts and writes them to a parquet store with WAL, flush, rotation, and pruning — matching the real node's write path
• Add configurable parquet store settings: ReceiptKeepRecent, ReceiptPruneIntervalSeconds, ReceiptMaxBlocksPerFile, ReceiptBlockFlushInterval
• Add receipt write metrics: receipt_block_write_duration_seconds (histogram), receipt_channel_depth (gauge), receipts_written_total (counter), receipt_errors_total (counter)
• Move block building to a background goroutine (blockBuilder) so transaction generation doesn't block the main execution loop

Set "GenerateReceipts": true to enable. See config/reciept-store.json for an example config. All receipt store tuning parameters have production-matching defaults and can be left unset.

Testing performed to validate your change

unit tests + running cryptosim simulation

[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, 7:19 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.42%. Comparing base (1d93a1a) to head (d329019).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3047   +/-   ##
=======================================
  Coverage   58.42%   58.42%           
=======================================
  Files        2088     2088           
  Lines      172102   172102           
=======================================
  Hits       100547   100547           
  Misses      62618    62618           
  Partials     8937     8937           

Flag	Coverage Δ
sei-chain-pr	75.27% <100.00%> (?)
sei-db	70.41% <ø> (ø)

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Files with missing lines	Coverage Δ
sei-db/ledger_db/receipt/parquet_store.go	67.42% <100.00%> (ø)

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