chore: move RPCv2CBOR implementation to smithy-swift #1571

Job	Run time
linux (jammy, 5.9)	12m 34s
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	13m 45s
linux (jammy, 6.0)	12m 59s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	11m 59s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	12m 48s
apple (macos-14, Xcode_15.2, platform=macOS)	11m 37s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	10m 24s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	12m 30s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	11m 39s
apple (macos-15, Xcode_16.1, platform=macOS)	10m 3s
	2h 0m 18s

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