Add differential testing harness #322

Job	Run time
Test (windows-2022, x86_64-pc-windows-msvc)	1m 57s
cargo-deny	1m 16s
Test (ubuntu-24.04, x86_64-unknown-linux-gnu)	1m 52s
Test (ubuntu-24.04, aarch64-linux-android, x86_64-unknown-linux-gnu)	2m 5s
Lint	5m 46s
Test (macOS-latest, x86_64-apple-darwin)	2m 7s
test_success	0s
Lint	5m 52s
Test (windows-2022, x86_64-pc-windows-msvc)	45m 56s
Test (ubuntu-24.04, x86_64-unknown-linux-gnu)	21m 34s
cargo-deny	57s
Test (ubuntu-24.04, aarch64-linux-android, x86_64-unknown-linux-gnu)	7m 59s
Test (macOS-latest, x86_64-apple-darwin)	16m 26s
test_success	2s
	1h 53m 49s

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