chore: move RPCv2CBOR implementation to smithy-swift #1566

Job	Run time
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	12m 32s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	11m 11s
linux (jammy, 5.9)	12m 16s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	12m 18s
linux (jammy, 6.0)	12m 51s
apple (macos-14, Xcode_15.2, platform=macOS)	11m 33s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	10m 9s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	10m 41s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	12m 2s
apple (macos-15, Xcode_16.1, platform=macOS)	10m 44s
	1h 56m 17s

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