fix(api): append auth info as head fields for appSync realtime handsh… #1139

Job	Run time
Build Amplify Swift for iOS / Build Amplify-Package \| iOS	14m 22s
Build Amplify Swift for macOS / Build Amplify-Package \| macOS	10m 19s
Build Amplify Swift for tvOS / Build Amplify-Package \| tvOS	15m 34s
Build Amplify Swift for watchOS / Build Amplify-Package \| watchOS	9m 21s
Confirm Passing Build Steps	1s
	49m 37s

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