feat: IAM auth token generator for RDS #4120

Job	Run time
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	8m 55s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	6m 19s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	7m 41s
apple (macos-14, Xcode_15.2, platform=macOS)	8m 38s
linux (jammy, 5.9)	8m 51s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	7m 51s
linux (jammy, 6.0)	9m 10s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	6m 33s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	7m 53s
apple (macos-15, Xcode_16.1, platform=macOS)	9m 40s
	1h 21m 31s

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