Tile Profiling

I wanted to PR this just to have a discussion about whether this seems like a worthy direction to head in. For the purposes of optimizing vector-tiles, these kinds of metrics could be really useful. Ideally we could implement this in a way that allows us to easily add additional metrics to collect as we identify them. For now I'm collecting a few bits of information about feature geometries: coordinates per feature, duplicate coordinates per feature, distance (in meters) between coordinates.

I'm curious if folks are open to this, dis/like the approach, have other ideas or suggestions?

cc @mikemorris @yhahn @springmeyer