Add API review changes.

Author: yuchenshi

common/api-review/util.api.md

@@ -218,6 +218,9 @@ export const getDefaultAppConfig: () => Record<string, string> | undefined;
 // @public
 export const getDefaultEmulatorHost: (productName: string) => string | undefined;
 
+// @public
+export const getDefaultEmulatorHostnameAndPort: (productName: string) => [hostname: string, port: number] | undefined;
+
 // @public
 export const getExperimentalSetting: <T extends ExperimentalKey>(name: T) => FirebaseDefaults[`_${T}`];