[EPIC] Support for ST_Distance

[harrism]

This issue is split from #231 since ST_Distance and ST_Contains are very different features. This issue serves to add a task list for ST_Distance.

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1. [FEA] Pairwise Point Polygon Distance #756
   feature request +1
   
2. [FEA] Pairwise LineString-Polygon Distance #757
   3 of 3
   feature request +1
   
3. [FEA] Pairwise Polygon-Polygon Distance #758
   3 of 3
   feature request +1
   
4. Pairwise point-point distance
5. Pairwise point-linestring distance
6. Pairwise linestring-linestring distance
7. [FEA] Support GeoSeries.distance #759
   0 of 3
   feature request +1
   
8. pairwise_distance(mixed_geometry_column lhs, mixed_geometry_column rhs) support #1058
   0 of 2
   feature request libcuspatial +2