feat(appcheck): implement RecaptchaEnterpriseProvider and tests #297

Job	Run time
pod_lib_lint / pod-lib-lint (macos-15, Xcode_26.2, macOS)	4m 20s
pod_lib_lint / pod-lib-lint (macos-26, Xcode_26.4, tvOS)	5m 50s
pod_lib_lint / pod-lib-lint (macos-15, Xcode_26.2, iOS)	24m 1s
spm-integration (FirebaseFunctionsIntegration) / spm-package-resolved	40s
pod_lib_lint / pod-lib-lint (macos-15, Xcode_26.2, watchOS)	4m 0s
spm-integration (FunctionsCombineUnit) / spm-package-resolved	32s
pod_lib_lint / pod-lib-lint (macos-26, Xcode_26.4, macOS)	6m 2s
spm-unit / spm-package-resolved	31s
spm-integration (FirebaseFunctionsObjCIntegration) / spm-package-resolved	45s
pod_lib_lint / pod-lib-lint (macos-15, Xcode_26.2, tvOS)	8m 13s
pod_lib_lint / pod-lib-lint (macos-26, Xcode_26.4, watchOS)	3m 14s
pod_lib_lint / pod-lib-lint (macos-26, Xcode_26.4, iOS)	15m 11s
spm-integration (FunctionsCombineUnit) / spm	0s
spm-unit / spm	0s
spm-integration (FirebaseFunctionsIntegration) / spm	1s
spm-integration (FirebaseFunctionsObjCIntegration) / spm	1s
functions-cron-only / cron-job	0s
	1h 13m 21s

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