Add constant-time assembly evidence generation #63

Job	Run time
Miri	4m 40s
Format, lint, test, and audit	1m 0s
Platform tests (windows-latest)	45s
Platform tests (macos-latest)	23s
no_std target build (thumbv7em-none-eabihf)	19s
no_std target build (x86_64-unknown-freebsd)	16s
no_std target build (wasm32-unknown-unknown)	17s
no_std target build (aarch64-unknown-linux-gnu)	20s
no_std target build (x86_64-unknown-linux-gnu)	17s
Platform tests (ubuntu-latest)	19s
	8m 36s

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