Draw: Export of circle geometries

[jokd]

Describe the bug
When exporting a circle geometry the resulting feature has no geometry.

To Reproduce
Steps to reproduce the behavior:

1. Draw a circle
2. Export to file

Expected behavior
A circle round and clear.

Additional context
Circles are not standard so the solution is probably to either store the feature as a point with a radius as a property or convert the circle to a polygon on export. One downside of the latter is you won't be able to edit the circle since it is made up of multiple short segments.

[steff-o]

If going for option 1 it might be a good idea to follow some sort of "standard" even if it really doesn't matter as the GeoJson exported will only be importable to Origo anyway. Azure has a syntax for storing extended geometry types: https://learn.microsoft.com/en-us/azure/azure-maps/extend-geojson

{
    "type": "Feature",
    "geometry": {
        "type": "Point",
        "coordinates": [-122.126986, 47.639754]
    },
    "properties": {
        "subType": "Circle",
        "radius": 100
    }
} 

Problem with that is that you can't have your own properties "subType" and "radius" if the feature supports arbitrary attributes. In that case the names should be prefixed with something that is unlikely to appear in the real world, like "origodraw_".