Add prototype for Firebase Vertex AI #7432

Job	Run time
changes	4s
spm-binary-cron	0s
check	3m 23s
cmake-prod-db (macos-12, (default))	50m 36s
sanitizers-ubuntu (ubuntu-latest, asan)	2m 31s
cmake-prod-db (macos-12, test-db)	28m 26s
sanitizers-mac (macos-12, asan)	22m 16s
cmake (macos-12)	4m 43s
sanitizers-mac (macos-12, tsan)	46m 59s
cmake (ubuntu-latest)	2m 18s
pod-lib-lint (FirebaseFirestoreInternal.podspec)	28m 5s
pod-lib-lint-cron	0s
pod-lib-lint (FirebaseFirestore.podspec)	24m 29s
pod-lib-lint (FirebaseFirestoreSwift.podspec)	23m 17s
spm-source (iOS, macos-13)	5m 51s
xcodebuild (iOS)	20m 30s
spm-source (iOS, macos-14)	6m 8s
xcodebuild (macOS)	17m 32s
spm-source (tvOS, macos-13)	6m 52s
xcodebuild (tvOS)	17m 37s
spm-source (tvOS, macos-14)	5m 13s
check-firestore-internal-public-headers	7s
spm-source (macOS, macos-13)	6m 0s
spm-source (macOS, macos-14)	5m 10s
spm-binary	3m 4s
spm-source (macos-14, visionOS, Xcode_15.3)	7m 23s
Check all required Firestore tests results	1s
	5h 38m 35s

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