Add ZSA functionality (upstream) #201

Job	Run time
Bitrot check	1m 31s
Book tests	1m 23s
Build target wasm32-unknown-unknown	1m 47s
Rustfmt	12s
Intra-doc links	1m 33s
Build target wasm32-wasi	1m 36s
Test on ubuntu-latest	7m 15s
Test on i686-unknown-linux-gnu	13m 41s
Test on windows-latest	9m 38s
Test on i686-unknown-linux-gnu with beta features	13m 7s
Test on macOS-latest	15m 7s
Test on i686-unknown-linux-gnu with nightly features	15m 54s
Test on ubuntu-latest with beta features	7m 27s
Test on windows-latest with beta features	9m 47s
Test on macOS-latest with beta features	16m 23s
Test on ubuntu-latest with nightly features	8m 9s
Test on windows-latest with nightly features	11m 13s
Test on macOS-latest with nightly features	14m 39s
	2h 30m 22s

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