perf: prevent closure creation in `AttributeList` #177

Job	Run time
No Warnings	57s
Check TODOs	11s
Check Formatting	16s
Run Tests	1m 16s
Test CSharpier.MSBuild (windows-latest)	2m 35s
Test CSharpier.MSBuild (ubuntu-latest)	2m 0s
Builds Playground	1m 7s
	8m 22s

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