Add EVM stress workload tooling

[codchen]

Summary

• Adds ./scripts/evm_stress.sh, which initializes a local seid node, patches genesis with deterministic sender accounts, starts the node, and runs the transfer workload.
• Adds scripts/evm_stress/main.go, which generates deterministic sender keys, optionally dumps their derived Sei addresses for genesis funding, and sends nonce-0 EVM transfers from unique senders to a shared recipient at the target rate.
• Ignores the local evm_stress build artifact.

This is split out from #3376 so the investigation tooling can be reviewed independently from logging and execution optimizations.

Test Plan

• go test ./scripts/evm_stress
• go run github.com/securego/gosec/v2/cmd/gosec@v2.22.11 ./scripts/evm_stress/...

[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	May 7, 2026, 4:54 AM

[codecov]

Codecov Report

❌ Patch coverage is 0% with 73 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.01%. Comparing base (ab54587) to head (825b721).

Files with missing lines	Patch %	Lines
scripts/evm_stress/main.go	0.00%	73 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3404      +/-   ##
==========================================
- Coverage   59.03%   59.01%   -0.03%     
==========================================
  Files        2105     2106       +1     
  Lines      173300   173373      +73     
==========================================
  Hits       102312   102312              
- Misses      62104    62177      +73     
  Partials     8884     8884              

Flag	Coverage Δ
sei-chain-pr	0.00% <0.00%> (?)
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
scripts/evm_stress/main.go	0.00% <0.00%> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.