Add option to drop sf geometry in cleanData function

[kaijagahm]

T/F with default to F

[kaijagahm]

@ryannguyen6392 this is something to be aware of as you go through the cleanData fixes. If it's straightforward to add the option to drop the sf geometry, consider doing this (but definitely default to keeping the geometry). If it's going to be a pain in the neck, don't prioritize it.

[kaijagahm]

Oh, and the function you'd want for this is sf::st_drop_geometry(dataset).