Add ZSA functionality (upstream) #195

Job	Run time
Bitrot check	1m 50s
Build target wasm32-unknown-unknown	1m 20s
Book tests	57s
Build target wasm32-wasi	1m 8s
Intra-doc links	58s
Rustfmt	12s
Test on ubuntu-latest	6m 51s
Test on i686-unknown-linux-gnu	12m 55s
Test on windows-latest	9m 17s
Test on macOS-latest	13m 59s
Test on i686-unknown-linux-gnu with beta features	12m 33s
Test on i686-unknown-linux-gnu with nightly features	14m 35s
Test on ubuntu-latest with beta features	6m 53s
Test on windows-latest with beta features	9m 31s
Test on macOS-latest with beta features	10m 30s
Test on ubuntu-latest with nightly features	7m 45s
Test on windows-latest with nightly features	10m 21s
Test on macOS-latest with nightly features	14m 58s
	2h 16m 33s

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