feat(benches): add Anvil IPC benchmark

[jbargu]

📝 Description

Fixes the benches from arbiter-core to arbiter-ethereum and adds an Anvil IPC test.

🔍 Changes include

• 🐛 Bugfix
• ✨ New feature
• 📚 Documentation
• ⚡ Performance improvement
• 🔨 Refactoring
• ✅ Test updates

🧪 Testing

cargo bench --package arbiter-ethereum

It produces a small improvement in comparison to RPC:

arbiter-ethereum version: 0.1.0
ethers-core anvil version: 2.0.14
Date: 2025-06-22
shape: (4, 7)
┌────────────────┬────────────┬────────────────┬──────────────┬────────────────────────┬───────────────────────┬───────────────────────┐
│ Operation      ┆ anvil (μs) ┆ anvil-ipc (μs) ┆ arbiter (μs) ┆ Speedup - arbiter vs   ┆ Speedup - arbiter vs  ┆ Speedup - anvil IPC   │
│ ---            ┆ ---        ┆ ---            ┆ ---          ┆ anvil RPC              ┆ anvil IPC             ┆ vs anvil RPC          │
│ str            ┆ f64        ┆ f64            ┆ f64          ┆ ---                    ┆ ---                   ┆ ---                   │
│                ┆            ┆                ┆              ┆ f64                    ┆ f64                   ┆ f64                   │
╞════════════════╪════════════╪════════════════╪══════════════╪════════════════════════╪═══════════════════════╪═══════════════════════╡
│ Deploy         ┆ 6179.0     ┆ 5723.0         ┆ 155.0        ┆ 39.864516              ┆ 36.922581             ┆ 1.079678              │
│ Lookup         ┆ 1341.0     ┆ 1026.0         ┆ 73.0         ┆ 18.369863              ┆ 14.054795             ┆ 1.307018              │
│ Stateless Call ┆ 1247.0     ┆ 935.0          ┆ 215.0        ┆ 5.8                    ┆ 4.348837              ┆ 1.33369               │
│ Stateful Call  ┆ 18941.0    ┆ 15956.0        ┆ 155.0        ┆ 122.2                  ┆ 102.941935            ┆ 1.187077              │
└────────────────┴────────────┴────────────────┴──────────────┴────────────────────────┴───────────────────────┴───────────────────────┘

📋 Checklist

• I have tested the changes locally
• I have updated the documentation accordingly
• I have added tests that prove my fix/feature works
• All tests pass locally

Additional notes

• Anvil CLI arguments