Make Radius required, use Black as colour in Circle

[lucanicoletti]

Both Polygon and Polyline use Black as the default colour, making them visible on the Map when used without specifying a colour.
Circle by default draws a 0-radius circle. If the radius is specified, it still draws a Transparent circle on the map, making it not visible.
Update the Circle function to require the radius to be specified, and change the default colour to Color.Black, as used in other Composable for Maps.
As it was a simple edit, I've done it already and I would be ready to open the PR if this is agreed upon

[wangela]

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@lnicolet Thank you for opening this issue. 🙏
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[lucanicoletti]

Is there any update on this? I'm happy to make the changes and open a PR request.