Add `CasePathsCore` module #554

Job	Run time
Wasm	2m 33s
macOS Library Evolution (Xcode 15.4)	3m 15s
Android	7m 46s
macOS Library Evolution (Xcode 16.2)	4m 0s
Check Macro Compatibility	2m 26s
Ubuntu (Swift 5.10)	8m 50s
macOS (Xcode 15.4)	6m 19s
macOS (Xcode 16.2)	5m 57s
	41m 6s

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