isAvailable method

Implementation

@override
Future<bool> isAvailable() async {
  try {
    return await methodChannel.invokeMethod<bool>('isAvailable') ?? false;
  } on MissingPluginException {
    return false;
  } on PlatformException catch (error) {
    throw NativeAddressAutocompleteException(
      error.message ?? 'Address autocomplete availability check failed.',
      code: error.code,
    );
  }
}