refactor: remove ExecutionPlan wrapper struct #422

Job	Run time
Format and Check Deps	1m 56s
Test (ubuntu-latest, x86_64-unknown-linux-gnu)	3m 55s
Test (namespace-profile-mac-default, x86_64-apple-darwin)	2m 49s
Test (windows-latest, x86_64-pc-windows-msvc)	4m 41s
Test (namespace-profile-mac-default, aarch64-apple-darwin)	1m 20s
done	3s
	14m 44s

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