Add prototype for Firebase Vertex AI #4450

Job	Run time
iOS-Device (macos-14)	3m 57s
platforms (tvOS, macos-13)	9m 52s
iOS-Device (macos-13)	5m 20s
platforms (tvOS, macos-14)	10m 15s
swift-build-run (macos-14)	13m 32s
swift-build-run (macos-13)	10m 0s
platforms (macOS, macos-13)	7m 1s
platforms (macOS, macos-14)	5m 15s
platforms (catalyst, macos-13)	6m 2s
platforms (catalyst, macos-14)	4m 47s
platforms (macos-14, visionOS, Xcode_15.3)	8m 52s
	1h 24m 53s

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