chore(perf): fast track eth_getStorageAt

[LesnyRumcajs]

Summary of changes

Changes introduced in this pull request:

• companion to chore: fast-track eth_getCode #7523 (but independent)

Reference issue to close (if applicable)

Closes

Other information and links

┌─────────────┬─────────────────────────┬────────────────────────┬──────────────────────────────┐
│ concurrency │      new (direct)       │       base (VM)        │             win              │
├─────────────┼─────────────────────────┼────────────────────────┼──────────────────────────────┤
│ c=48        │ 14,933 req/s            │ 8,345 req/s            │ ~1.8×                        │
├─────────────┼─────────────────────────┼────────────────────────┼──────────────────────────────┤
│ c=128       │ 15,144 req/s (max 55ms) │ 1,200 req/s (max 2.9s) │ ~12.6× throughput, ~53× tail │
└─────────────┴─────────────────────────┴────────────────────────┴──────────────────────────────┘

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

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