[AI] Add ImageConfig support for generateContent #645

Job	Run time
changes	12s
spm-binary / spm-package-resolved	1m 16s
spm-package-resolved	1m 12s
spm-binary-cron	0s
spm-source-cron	0s
check	0s
xcodetest_prod	0s
pod-lib-lint-cron	0s
pod_lib_lint	0s
sanitizers-ubuntu	0s
cmake	0s
sanitizers-mac	0s
xcodetest_emulator	0s
spm-source	0s
spm-binary / spm (macos-26, Xcode_26.2, iOS)	9m 35s
spm-binary / spm (macos-15, Xcode_16.4, catalyst)	19s
spm-binary / spm (macos-15, Xcode_16.4, iOS)	2m 50s
spm-binary / spm (macos-15, Xcode_16.4, watchOS)	2m 49s
spm-binary / spm (macos-26, Xcode_26.2, catalyst)	25s
spm-binary / spm (macos-14, Xcode_16.2, iOS)	6m 3s
spm-binary / spm (macos-26, Xcode_26.2, visionOS)	33s
spm-binary / spm (macos-26, Xcode_26.2, tvOS)	26s
spm-binary / spm (macos-26, Xcode_26.2, macOS)	19s
spm-binary / spm (macos-15, Xcode_16.4, tvOS)	1m 58s
spm-binary / spm (macos-26, Xcode_26.2, watchOS)	45s
spm-binary / spm (macos-15, Xcode_16.4, visionOS)	42s
spm-binary / spm (macos-15, Xcode_16.4, macOS)	21s
Check all required Firestore tests results	0s
	29m 45s

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