refactor: extract materialized_artifact crate out of fspy (#344) #1357

Job	Run time
Format and Check Deps	45s
detect-changes	4s
Test (musl)	2m 12s
Clippy	58s
Test (namespace-profile-mac-default, aarch64-apple-darwin, cargo, aarch64-apple-darwin)	40s
Test (namespace-profile-linux-x64-default, x86_64-unknown-linux-gnu, cargo-zigbuild, x86_64-unkno...	1m 14s
Test (namespace-profile-mac-default, x86_64-apple-darwin, cargo, x86_64-apple-darwin)	1m 39s
Test (windows-latest, x86_64-pc-windows-msvc, cargo, x86_64-pc-windows-msvc)	5m 42s
done	2s
	13m 16s

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