chore: getProof benchmark utility added

[dhyaniarun1993]

Utility for #446

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.34%. Comparing base (69f6061) to head (207d8d6).

Additional details and impacted files

see 2 files with indirect coverage changes

Flag	Coverage Δ
e2e	35.74% <ø> (-0.01%)	⬇️
unit	26.89% <ø> (ø)

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Components	Coverage Δ
reth binary	53.14% <ø> (ø)
op historical proof	90.12% <ø> (ø)

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[Copilot]

Pull request overview

This PR adds a Go-based benchmark utility to measure the performance of the eth_getProof RPC method by testing historical proof requests against the WETH contract on Optimism. The utility is designed to support performance analysis for issue #446.

Key changes:

• Implements a concurrent benchmark tool that measures eth_getProof latency across configurable block ranges
• Targets WETH contract with pre-defined holder addresses and calculates storage slots for balance mappings
• Reports aggregated latency statistics (avg/min/max) and error counts per block interval

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[emhane]

can we pls move this to a new directory op-reth-bench in
https://github.com/op-rs/op-reth/tree/unstable/bin

[itschaindev]

lgtm