feat(iroh): implement Discovery for Arc'ed Discovery types #12137

Job	Run time
Cross Test (i686-unknown-linux-gnu)	1m 54s
Cross Build Only (x86_64-unknown-freebsd)	44s
check_semver	4m 4s
Android Build Only (aarch64-linux-android)	1m 3s
Checking docs	1m 32s
Android Build Only (armv7-linux-androideabi)	1m 4s
Build wasm32	29s
cargo deny	31s
Checking fmt	19s
clippy_check	1m 58s
codespell	9s
Minimal Supported Rust Version	1m 16s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 26s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 23s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 4s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	2m 35s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	2m 16s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	2m 21s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 20s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	2m 11s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 35s
netsim-integration-tests / Netsim	5m 1s
	41m 15s

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