Add `CasePathsCore` module #553

Job	Run time
Check Macro Compatibility	1s
macOS (Xcode 15.4)	1s
Ubuntu (Swift 5.10)	1m 20s
macOS Library Evolution (Xcode 15.4)	1s
macOS (Xcode 16.2)	1s
macOS Library Evolution (Xcode 16.2)	1s
Wasm	1m 34s
Android	1m 22s
	4m 21s

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