Add support for "config" to be a templated field in the EmrServerlessCreateApplicationOperator

Hi, I'd like that `config` in the `EmrServerlessCreateApplicationOperator` be a templated field so that I can use jinja templates in it. Would it be possible to incorporate it into the next release? I have tried overriding the operator and it's worked just fine:
```
class CustomEmrServerlessCreateApplicationOperator(EmrServerlessCreateApplicationOperator):
template_fields: Sequence[str] = ("config",)
```

Thanks!

Locate the EmrServerlessCreateApplicationOperator and inspect how its template fields are declared. Compare it with the issue's working override, then verify that config supports Jinja templating without requiring a custom subclass.

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