metal : implement rope_back operator (#24725) #1143

Job	Run time
macos-latest-ios-xcode	23m 14s
macos-latest-tvos	2m 5s
macos-latest-x64	9m 3s
macos-latest-arm64	6m 55s
macos-latest-visionos	2m 51s
macos-latest-swift (generic/platform=tvOS)	5m 0s
macos-latest-swift (generic/platform=iOS)	6m 7s
macos-latest-swift (generic/platform=macOS)	4m 4s
	59m 19s

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