[work in progress] Optimization

[andy-esch]

cc @stuartlynn

• [x] All declared geometries are geometry(Geometry, 4326) for general geoms, or geometry(Point, 4326)
• [x] Existing functions in crankshaft python library called from the extension are kept at least from version N to version N+1 (to avoid breakage during upgrades).
• [ ] Docs for public-facing functions are written
• [x] New functions follow the naming conventions: CDB_NameOfFunction. Where internal functions begin with an underscore
• [ ] Hand-off document for camshaft node written
• [x] If function is in Python, code conforms to PEP8 Style Guide

[andy-esch]

closing as this work will not end up in the crankshaft extension, but is now a SQL node for client work.