Big geojson

Hi!

I am trying to open a large and complex GeoJSON. I get an error message suggesting that I should use the `OGR_GEOJSON_MAX_OBJ_SIZE` option.

```
CREATE OR REPLACE TABLE urban AS SELECT * FROM ST_Read('./data/Urban.json',open_options=['OGR_GEOJSON_MAX_OBJ_SIZE=0']);
```

But when I do, nothing seems to change.

Is this option implemented?

Thank you!