Refactor hydrofabric3D FEMA extender code

[anguswg-ucsb]

hydrofabric3D::extend_transects_to_polygons() needs to be refactored into 3 separate functions/steps:

1. Determine transects that need extending given a polygon
2. Retrieve the distances to extend each transect in left and right directions
3. Apply extension distances to transects with flowlines

Right now these 3 steps are all under a single function and making maintaining/improving for performance tougher. Its hard to pinpoint slow points when so many steps are going on, particularly when the slowpoints are memory related

[anguswg-ucsb]

Closing this issue as hydrofabric3D::extend_transects_to_polygons() has been heavily refactored

• Changes can be see here and were brought in from this PR
• Updated the utility functions that go into hydrofabric3D::extend_transects_to_polygons()
• Made the code more maintainable by breaking logic in hydrofabric3D::extend_transects_to_polygons() into multiple self contained sub functions
• BIG speed/memory optimization gain from changing a geos::geos_intersects() call into geos::geos_intersects_matrix() call in the hydrofabric3D::geos_bs_distance() function which run on every transect and thus gets a lot of use