Add support for place=province equivalent to place=state

[zekefarwell]

This adds support for place=province nodes, giving them the same label text treatment as already supported place=state nodes. The status quo for Canadian provinces is that their place nodes have been tagged place=state but should they be changed to place=province we'd still want labels on the map. It looks like place=province is currently used in a few other countries including Turkey, Thailand, and Japan. We should make sure these are direct country subdivisions before merging this.

[ZeLonewolf]

Confirmed that this works on the current planet (before restoration of place=state nodes).

I think this can be done a bit more compactly with a single "in" expression, something like:

filter: ["in", ["get", "class"], "state", "province"]

[zekefarwell]

Here's a overpass query showing all place=province nodes worldwide: https://overpass-turbo.eu/s/1V25

It looks to me like the place=province nodes are used consistently across Turkey, Thailand, South Korea, and Japan to represent direct national subdivisions. Beyond that, the tag is used sporadically in Italy, Saudi Arabia, Burundi, and Peru. These uses are less clear to me but there are only a few of them. place=province is clearly documented as being for "a subdivision of a country similar to a state". So I'm fairly confident this is a good change and if any current uses are for lower level divisions they should be changed anyway.