GeoDataFrames as an AbstractDataFrame subtype?

[alex-s-gardner]

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I'm wondering if making GeoDataFrames as a AbstractDataFrame subtype would be a good idea? I'm thinking that eventually adding a Makie plotting extension (as simple as parsing geometries and select attributes) would be a powerful addition to GeoDataFrames. This would make GeoDataFrames behave more like Rasters, helping to unify the JuliaGeo ecosystem. This issue is related to https://github.com/evetion/GeoDataFrames.jl/issues/113