The `net_income_loss` field is not found in this library ([data model definition](https://github.com/polygon-io/client-python/blob/master/polygon/rest/models/financials.py)), but the original api endpoint returns the `net_income_loss` field.  https://polygon.io/docs/stocks/get_vx_reference_financials Can we add this field and other related fields for this library? I'd like to contribute if it's ok :)