feat: task graph loading (#48) #120

Job	Run time
Lint	1m 45s
Test (ubuntu-latest, x86_64-unknown-linux-gnu)	3m 4s
Test (namespace-profile-mac-default, aarch64-apple-darwin)	53s
Test (windows-latest, x86_64-pc-windows-msvc)	6m 21s
done	3s
	12m 6s

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