refactor(iroh): move code from builder to node and make things nicer #8671

Job	Run time
Cross Test (i686-unknown-linux-gnu)	1m 37s
Cross Build Only (armv7-linux-androideabi)	1m 2s
Cross Build Only (aarch64-linux-android)	1m 4s
Build wasm32	1m 0s
Cross Build Only (x86_64-unknown-freebsd)	1m 7s
Checking docs	1m 34s
Cross Build Only (x86_64-unknown-netbsd)	1m 9s
Checking fmt	41s
check_semver	3m 13s
clippy_check	2m 32s
cargo deny	30s
Minimal Supported Rust Version	1m 40s
Run network simulations/benchmarks	3m 46s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 56s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1m 30s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 40s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 53s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 54s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 46s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	2m 1s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	1m 52s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	2m 1s
	39m 28s

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