refactor: Move `iroh-router` into `iroh-net` and rename `iroh-net` to `iroh` #11502

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	47s
Checking fmt	17s
Android Build Only (aarch64-linux-android)	1m 6s
check_semver	2m 28s
Android Build Only (armv7-linux-androideabi)	1m 8s
Cross Test (i686-unknown-linux-gnu)	2m 18s
Build wasm32	32s
clippy_check	2m 22s
cargo deny	27s
Checking docs	1m 37s
codespell	4s
Minimal Supported Rust Version	1m 50s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 58s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 35s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 39s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	2m 25s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 3s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 31s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	2m 21s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	2m 8s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	2m 0s
netsim-integration-tests / Netsim	6m 2s
	42m 38s

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