ENH: polyfill_resample distributes numeric values appropriately

[DahnJ]

Currently, polyfill_resample simple leaves any numeric values untouched.

This makes sense for "relative" values, e.g. a percentage of unemployed, but makes less sense for absolute values, e.g. total population.

For absolute values, it would make sense to simply divide the amount by the number of generated H3 cells. If the polygon's population is 100 and it generated 20 H3 cells, then I'd expect each cell to be assigned 5 people.

There are other advanced strategies, but those are, in my opinion, are best left to packages that focus on spatial resampling, such as Tobler.

The challenge will be to provide this functionality in a clean and configurable way.