metal : log `recommendedMaxWorkingSetSize` on iOS 16+ (#4936)
* metal: Log `recommendedMaxWorkingSetSize` on iOS 16+
* Only log on iOS and macOS, ignoring tvOS and other platforms
* Check for Xcode version before using recommendedMaxWorkingSetSize
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
