feat: spam rpc

[0xl3on]

Motivation

Hey guys, pretty big feature so sorry for the big PR:

Closes #462

Each RPC method is strongly typed clap subcommand, as mentioned in the issue. eth_sendRawTransaction is excluded because nonce is baked into the signed payload so spamming would fail.

Solution

Changes from existing code:

• Moved inner logic from collect_latency_metrics at test_scenario.rs to a shared function at bucket.rs so we can re-use across tx and rpc spam
• Extended the gen html logic to also support rpc spam specific metrics

New code

• Added rpc command
• New rpc.rs module with the spam logic

PR Checklist

• Added Tests
• Added Documentation
• Ran cargo +nightly clippy --workspace --lib --examples --tests --benches --all-features --locked --fix
• Ran cargo fmt --all
• Note breaking changes in PR description, if applicable
• update changelogs
  • Update CHANGELOG.md in each affected crate
  • add a high-level description in the root changelog

[zeroXbrock]

thanks @0xl3on -- should be able to review tomorrow!

[zeroXbrock]

nice work, this is great! Had a good bit of fun testing this.

One thing I might add -- can we log the responses from the RPC calls? I can see from my node's logs that the RPC calls are working, but I think it would be helpful to see what the endpoints are returning, in case the user provides erroneous input (erroneous to the method call but passable by the serializer)

[zeroXbrock]

looks good, thanks @0xl3on!