Add ZSA functionality (upstream) #199

Job	Run time
Bitrot check	1m 34s
Book tests	1m 31s
Build target wasm32-unknown-unknown	1m 56s
Build target wasm32-wasi	1m 44s
Intra-doc links	1m 32s
Rustfmt	15s
Test on ubuntu-latest	7m 19s
Test on i686-unknown-linux-gnu	13m 41s
Test on i686-unknown-linux-gnu with beta features	14m 4s
Test on i686-unknown-linux-gnu with nightly features	15m 31s
Test on windows-latest	9m 33s
Test on macOS-latest	8m 46s
Test on ubuntu-latest with beta features	7m 13s
Test on windows-latest with beta features	9m 42s
Test on macOS-latest with beta features	12m 0s
Test on ubuntu-latest with nightly features	8m 22s
Test on windows-latest with nightly features	11m 9s
Test on macOS-latest with nightly features	14m 51s
	2h 20m 43s

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