refactor: Move the simple node from test scope to behind a feature flag #60

Job	Run time
Checking docs	1m 13s
Android Build Only (aarch64-linux-android)	1m 12s
cargo deny	29s
Checking fmt	40s
Android Build Only (armv7-linux-androideabi)	1m 14s
check_semver	26s
clippy_check	1m 58s
codespell	5s
Cross Build Only (x86_64-unknown-freebsd)	49s
Cross Test (i686-unknown-linux-gnu)	30m 15s
Minimal Supported Rust Version	1m 29s
CI Test Suite / Tests (ubuntu-latest, stable, all)	30m 16s
CI Test Suite / Tests (ubuntu-latest, stable, none)	52s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	30m 5s
CI Test Suite / Tests (ubuntu-latest, stable, default)	30m 16s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	30m 13s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	1m 3s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 8s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	30m 12s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	30m 3s
	3h 43m 58s

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