refactor(iroh): add `--start` option to CLI commands #5870

Job	Run time
Cross compile (i686-unknown-linux-gnu)	3m 12s
Build and test (Windows) (windows-latest, nightly, x86_64-pc-windows-msvc)	7m 37s
Cross compile (armv7-linux-androideabi)	36s
Build and test (Nix) (ubuntu-latest, nightly)	2m 20s
Checking fmt and docs	1m 29s
Build and test (Windows) (windows-latest, stable, x86_64-pc-windows-msvc)	7m 29s
Cross compile (aarch64-linux-android)	36s
Build and test (Nix) (ubuntu-latest, stable)	3m 22s
Build and test (Nix) (macOS-arm-latest, nightly)	7m 27s
Build and test (Nix) (macOS-arm-latest, stable)	7m 33s
cargo deny	28s
clippy_check	3m 3s
Minimal Supported Rust Version	1m 44s
Run network simulations/benchmarks	1s
Build release binaries	1s
	46m 58s

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