Add Firebase AppleApp Data Source

.changelog/6876.txt

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+```release-note:new-datasource
+`google_firebase_apple_app`
+```

google/data_source_google_firebase_apple_app.go

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+package google

google/data_source_google_firebase_apple_app_test.go

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+package google

website/docs/d/firebase_android_app.html.markdown

@@ -20,7 +20,7 @@ The following arguments are supported:
 
 * `app_id` -
   (Required)
-  The app_ip of name of the Firebase androidApp.
+  The app_id of name of the Firebase androidApp.
 
 
 - - -

website/docs/d/firebase_apple_app.html.markdown

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+---
+subcategory: "Firebase"
+page_title: "Google: google_firebase_apple_app"
+description: |-
+  A Google Cloud Firebase Apple application instance
+---
+
+# google\_firebase\_apple\_app
+
+A Google Cloud Firebase Apple application instance
+
+~> **Warning:** This resource is in beta, and should be used with the terraform-provider-google-beta provider.
+See [Provider Versions](https://terraform.io/docs/providers/google/guides/provider_versions.html) for more details on beta resources.
+
+
+## Argument Reference
+
+The following arguments are supported:
+
+
+* `app_id` -
+  (Required)
+  The app_id of name of the Firebase iosApp.
+
+
+- - -
+
+
+* `project` - (Optional) The ID of the project in which the resource belongs.
+    If it is not provided, the provider project is used.
+
+
+## Attributes Reference
+
+In addition to the arguments listed above, the following computed attributes are exported:
+
+* `id` - an identifier for the resource with format `{{name}}`
+
+* `name` -
+  The fully qualified resource name of the App, for example:
+  projects/projectId/iosApps/appId
+
+* `app_id` -
+  Immutable. The globally unique, Firebase-assigned identifier of the App.
+  This identifier should be treated as an opaque token, as the data format is not specified.
+
+* `display_name` -
+  The user-assigned display name of the App.
+
+* `bundle_id` -
+  The canonical bundle ID of the Apple app as it would appear in the Apple AppStore.
+
+* `app_store_id` -
+  The automatically generated Apple ID assigned to the Apple app by Apple in the Apple App Store.
+
+* `team_id` -
+  The Apple Developer Team ID associated with the App in the App Store.