chore: move RPCv2CBOR implementation to smithy-swift #4281

Job	Run time
linux (jammy, 5.9)	10m 20s
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	21m 10s
linux (jammy, 6.0)	10m 36s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	10m 12s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	11m 38s
apple (macos-14, Xcode_15.2, platform=macOS)	10m 5s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	27m 44s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	14m 10s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	10m 3s
apple (macos-15, Xcode_16.1, platform=macOS)	17m 48s
	2h 23m 46s

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