[Proposal] Consider running `cargo-udeps` in CI

[mohammadfawaz]

💥 Proposal

Would be fairly and easy to do and not too expensive. Finds all unused dependencies in the workspace. We can configure CI to fail if the tools returns any unused dependencies.

• Tool: https://crates.io/crates/cargo-udeps
• Requires nightly
• Run with cargo +nightly udeps --workspace --all-targets