Discussion: make GeoDataFrames the main entry point for vector data

[asinghvi17]

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From https://discourse.julialang.org/t/screening-interest-in-a-unified-vector-raster-package-akin-to-r-terra/121613, it might make sense to make GeoDataFrames a single point of entry for vector datasets.

Would there be interest in creating a "backend system" for GeoDataFrames, so that we can use native Julia readers wherever possible, and fall back to ArchGDAL when needed? This would probably help performance quite a bit as well.

The other proposal was that GeoDataFrames could re-export Extents.jl and GeoFormatTypes.jl, so that users don't need to know about those!