Feature request: Support schema annotation to enable simpleResolvers for a single object type.

We are running into performance issues with one of our models and would like to set `simpleResolvers: true` for just that model. I don't want to enable it globally because we use middleware / authorization on other models.

I think something like the following would work?
```
/// @TypeGraphQL.simpleResolvers(true)
model User {
...
}
```

Alternatives we've considered:
- Applying a patch on the generated model file won't work for us, because our models are generated into `node_modules` and therefore not included in source control, so there's no easy way for us to maintain the patch. Moving generated files into source control opens up a can of worms for us
- That's all we've considered

No file, test, or entry point is named. Start by tracing how the generator reads model annotations and applies the global simpleResolvers setting; define done as enabling simpleResolvers for one model without changing middleware or authorization behavior on other models.

Written by the indexing model from the issue text.