Frontend-Backend split #888

Job	Run time
Bitrot check	4m 24s
Build target wasm32-unknown-unknown	3m 30s
Intra-doc links	3m 18s
Build target wasm32-wasi	3m 16s
Rustfmt	15s
Test on ubuntu-latest with basic features	7m 41s
Test on windows-latest with basic features	10m 26s
Test on macOS-latest with basic features	20m 4s
Test on ubuntu-latest with all features	8m 15s
Test on windows-latest with all features	10m 50s
Test on macOS-latest with all features	29m 5s
	1h 41m 4s

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