Isolate.resolvePackageUri does throw on iOS

[mathisfouques]

On iOS 16.0, the call to Isolate.resolvePackageUri throw a Unhandled Exception: Unsupported operation: Isolate.resolvePackageUri .

It is called in the lib/standalone.dart file, in the method initializeTimeZone, when it calls _loadAsBytes (which itself calls the Isolate.resolvePackageUri function).

I am able to solve it by using the latest.dart file instead of the call to resolvePackageUri that calls the .tz database file.

Here is my function that makes a call directly to lib/src/env.dart "initializeDatabase"

Future<void> _initializeTimeZone([String? path]) {
  path ??= tzDataDefaultPath;

  return Isolate.run(getTimezoneData)
      .then(initializeDatabase)
      .catchError((dynamic e) {
    throw TimeZoneInitException(e.toString());
  });
}

and uses this function from latest.dart that I added

Uint8List getTimezoneData() =>
    Uint16List.fromList(_embeddedData.codeUnits).buffer.asUint8List();

I think by making a PR we could do something more maintainable, but before I need to know if there is any particular reason why we would call Isolate.resolvePackageUri, or if there is anything that would prevent from doing a PR on this topic ?

Thanks