Calling Sentry capture methods within a new Isolate does not work

### Description

Works fine:

```
throwingClosure(String message) async {
throw StateError(message);
}

final isolate = await Isolate.spawn(throwingClosure, "message", paused: true);
isolate.addSentryErrorListener();
isolate.resume(isolate.pauseCapability!);
```

Does not work:

```
throwingClosure(String message) async {
Sentry.captureException(message);
}

final isolate = await Isolate.spawn(throwingClosure, "message", paused: true);
isolate.addSentryErrorListener();
isolate.resume(isolate.pauseCapability!);
```

In this case, when you call any capture method, the `Hub` is `NoOpHub`, it's like the SDK isn't initialized within a different isolate, most likely because isolates are isolated :D and don't share any memory.