Add ZSA functionality (upstream) #178

Job	Run time
Build target wasm32-unknown-unknown	4m 29s
Book tests	4m 19s
Bitrot check	1m 34s
Build target wasm32-wasi	4m 23s
Intra-doc links	4m 23s
Rustfmt	15s
Test on ubuntu-latest	9m 38s
Test on windows-latest	11m 31s
Test on macOS-latest	14m 8s
Test on ubuntu-latest with beta features	9m 31s
Test on windows-latest with beta features	11m 27s
Test on macOS-latest with beta features	19m 9s
Test on ubuntu-latest with nightly features	10m 38s
Test on windows-latest with nightly features	12m 31s
Test on macOS-latest with nightly features	18m 56s
	2h 16m 52s

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