Add a benchmark mode

[stevenlanders]

Describe your changes and provide context

• run /scripts/benchmark.sh, and it'll auto-produce 1000-tx blocks of evm transfers and measure tps

Testing performed to validate your change

• local testing
• unit tests

[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	Nov 13, 2025, 3:16 PM

[codecov]

Codecov Report

❌ Patch coverage is 46.06061% with 89 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.35%. Comparing base (5ae1ad8) to head (e145c4f).

Files with missing lines	Patch %	Lines
app/benchmark.go	46.71%	81 Missing ⚠️
x/evm/config/config.go	0.00%	5 Missing ⚠️
app/app.go	62.50%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2543      +/-   ##
==========================================
+ Coverage   43.34%   43.35%   +0.01%     
==========================================
  Files        1576     1577       +1     
  Lines      137842   138006     +164     
==========================================
+ Hits        59744    59834      +90     
- Misses      72678    72751      +73     
- Partials     5420     5421       +1     

Flag	Coverage Δ
sei-chain	31.16% <44.17%> (+0.06%)	⬆️
sei-cosmos	52.55% <ø> (-0.01%)	⬇️
sei-db	47.63% <ø> (+0.03%)	⬆️
sei-tendermint	48.85% <ø> (+<0.01%)	⬆️
sei-wasmd	46.35% <100.00%> (+0.07%)	⬆️
sei-wasmvm	40.37% <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	73.29% <62.50%> (-0.02%)	⬇️
x/evm/config/config.go	0.00% <0.00%> (ø)
app/benchmark.go	46.71% <46.71%> (ø)

... and 14 files with indirect coverage changes

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