Add ZSA functionality (upstream) #203

Job	Run time
Bitrot check	1m 35s
Book tests	1m 27s
Build target wasm32-unknown-unknown	1m 52s
Intra-doc links	1m 31s
Build target wasm32-wasi	1m 38s
Rustfmt	13s
Test on i686-unknown-linux-gnu	13m 30s
Test on ubuntu-latest	7m 22s
Test on i686-unknown-linux-gnu with beta features	12m 58s
Test on windows-latest	9m 29s
Test on i686-unknown-linux-gnu with nightly features	15m 14s
Test on macOS-latest	17m 19s
Test on ubuntu-latest with beta features	7m 16s
Test on windows-latest with beta features	9m 51s
Test on macOS-latest with beta features	11m 28s
Test on ubuntu-latest with nightly features	8m 11s
Test on windows-latest with nightly features	10m 58s
Test on macOS-latest with nightly features	19m 26s
	2h 31m 18s

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