chore: Marking Storage's key-based API as deprecated in the Category … #349

Job	Run time
Build Amplify Swift for macOS / Build Amplify-Build \| macOS	5m 45s
Build Amplify Swift for iOS / Build Amplify-Build \| iOS	8m 13s
Build Amplify Swift for tvOS / Build Amplify-Build \| tvOS	6m 27s
Build Amplify Swift for watchOS / Build Amplify-Build \| watchOS	5m 19s
Confirm Passing Build Steps	1s
	25m 45s

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