Add necessary features for ZSA integration #502

Job	Run time
Bitrot check	1m 29s
Book tests	2m 8s
Build target wasm32-unknown-unknown	2m 31s
Build target wasm32-wasi	2m 24s
Intra-doc links	2m 8s
Rustfmt	16s
Test on ubuntu-latest	10m 39s
Test on i686-unknown-linux-gnu	21m 3s
Test on windows-latest	14m 12s
Test on i686-unknown-linux-gnu with beta features	22m 2s
Test on macOS-latest	8m 12s
Test on ubuntu-latest with beta features	10m 43s
Test on i686-unknown-linux-gnu with nightly features	21m 7s
Test on windows-latest with beta features	14m 3s
Test on macOS-latest with beta features	9m 5s
Test on ubuntu-latest with nightly features	10m 56s
Test on windows-latest with nightly features	14m 15s
Test on macOS-latest with nightly features	9m 10s
	2h 56m 23s

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