Add differential testing harness #420

Job	Run time
Test (ubuntu-24.04, x86_64-unknown-linux-gnu)	8m 31s
Lint	6m 0s
cargo-deny	1m 4s
Test (ubuntu-24.04, aarch64-linux-android, x86_64-unknown-linux-gnu)	8m 24s
Test (windows-2022, x86_64-pc-windows-msvc)	8m 16s
Test (macOS-latest, x86_64-apple-darwin)	8m 35s
test_success	1s
	40m 51s

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