Add CI support for doc tests. (#737) #1758

Job	Run time
cargo check (msrv) (windows-latest)	1m 40s
cargo check (msrv) (wasm32)	39s
cargo check (msrv) (macos-latest)	43s
cargo check (msrv) (ubuntu-latest)	43s
cargo check (aarch64-android)	20s
cargo clippy (windows-latest)	2m 33s
cargo clippy (wasm32)	1m 26s
cargo clippy (macos-latest)	1m 6s
cargo clippy (ubuntu-latest)	1m 34s
cargo doc	1m 44s
formatting	21s
Prime LFS Cache	4s
cargo test (wasm32)	25s
typos	7s
cargo test (windows-latest)	3m 33s
cargo test (macos-latest)	2m 7s
cargo test (ubuntu-latest)	4m 36s
	23m 41s

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