feat(engine): no_std engine types #3901

Job	Run time
wasm-unknown	54s
clippy	44s
docs	59s
check no_std	24s
doctest	1m 23s
feature-checks	1m 24s
wasm-wasi	1m 17s
test ubuntu-latest stable --no-default-features	1m 22s
cfg-check	25s
test ubuntu-latest stable	1m 22s
fmt	11s
test ubuntu-latest stable --all-features	1m 22s
test ubuntu-latest nightly --no-default-features	1m 8s
test ubuntu-latest nightly	1m 6s
test ubuntu-latest nightly --all-features	1m 22s
test ubuntu-latest 1.79 --no-default-features	40s
test ubuntu-latest 1.79	35s
test windows-latest stable --no-default-features	1m 7s
test windows-latest stable	1m 6s
test windows-latest stable --all-features	1m 16s
test windows-latest nightly --no-default-features	1m 14s
test windows-latest nightly	1m 14s
test windows-latest nightly --all-features	1m 13s
test windows-latest 1.79 --no-default-features	1m 7s
test windows-latest 1.79	1m 6s
	26m 1s

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