raptorcast: latency measurement binary

[dshulyak]

i am using this binary for simulations, would like to merge so that it is easier to use it in various branches

[Copilot]

Pull Request Overview

This PR adds a new latency measurement binary for RaptorCast simulations. The tool enables performance testing by measuring message propagation latency across a cluster of nodes in producer/consumer configurations.

Key Changes:

• New latency.rs example binary with producer/consumer modes for latency measurement
• Configuration generation utility for creating test clusters
• Mock message implementation with timestamp-based latency tracking

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
monad-raptorcast/examples/latency.rs	New latency measurement tool with producer/consumer modes and cluster config generation
monad-raptorcast/Cargo.toml	Added dependencies for the latency example (jemalloc, toml, serde, humantime, byte-unit, eyre)
Cargo.toml	Added workspace dependencies for byte-unit and humantime

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[Copilot]

The assertion provides no helpful error message when the dataplane fails to become ready. Consider replacing with an error that includes context: eyre::ensure!(dataplane.block_until_ready(Duration::from_secs(2)), \"dataplane failed to become ready within 2 seconds\")

Suggested change

	assert!(dataplane.block_until_ready(Duration::from_secs(2)));
	eyre::ensure!(
	dataplane.block_until_ready(Duration::from_secs(2)),
	"dataplane failed to become ready within 2 seconds"
	);