feat: concurrent task execution with DAG scheduler #959

Job	Run time
Format and Check Deps	1m 12s
detect-changes	5s
Test (macos-latest, x86_64-apple-darwin)	6m 23s
Test (windows-latest, x86_64-pc-windows-msvc)	4m 26s
Test (musl)	10m 39s
Test (macos-latest, aarch64-apple-darwin)	2m 25s
Test (ubuntu-latest, x86_64-unknown-linux-gnu)	2m 10s
Clippy	1m 9s
done	3s
	28m 32s

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