Set Precision for Coordinates about rgeo HOT 4 CLOSED

Hi @preisb we don't currently have that on the roadmap, but if you're interested in tackling it we'd greatly appreciate it and will help out along the way.

I think it would make sense to model it off of how JTS/GEOS handles it because that way it would be easy to enable precision in GEOS factories as well as cartesian/spherical factories. GEOS uses a precision model object as a parameter in their factories. I'm not sure exactly how it works, but I assume that every point created in that factory with a precision model will be bound to that grid. Here are the JTS docs on it: https://locationtech.github.io/jts/javadoc/org/locationtech/jts/geom/PrecisionModel.html.

In addition to that, it could be nice to map existing geometries to a specific precision, so adding a to_precision(scale) method would be nice as well, but this will be dependent on how we implement the first part I think.

So to start we should figure out how the precision model works in JTS and see how that maps over to RGeo from a high level, then we can get into the specifics of what would need to be done for each factory type.

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@keithdoggett thanks for the directions. I will look into it.

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Thanks @preisb! If you have any questions along the way or something you want to discuss please post it in here and we can work through it.

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@keithdoggett I wanted to inform you, that we have stopped development on this feature. It turned out that for our usecase ST_AsGeoJSON with the maxdecimaldigits argument suites best.
Thanks for your help.

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