Add ZSA functionality (upstream) #184

Job	Run time
Bitrot check	1m 33s
Book tests	4m 12s
Build target wasm32-unknown-unknown	4m 32s
Intra-doc links	4m 9s
Rustfmt	13s
Build target wasm32-wasi	4m 20s
Test on ubuntu-latest	9m 50s
Test on windows-latest	11m 45s
Test on macOS-latest	11m 51s
Test on ubuntu-latest with beta features	9m 46s
Test on windows-latest with beta features	11m 20s
Test on macOS-latest with beta features	11m 56s
Test on ubuntu-latest with nightly features	10m 28s
Test on windows-latest with nightly features	12m 36s
Test on macOS-latest with nightly features	15m 59s
	2h 4m 30s

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