Add max_size restriction for custom schemas [FEATURE]

[quincylvania]

We're using min_size over at OpenTrailMap to progressively show POIs for notable parks at the given zoom level. This works great when the park is contained in the viewport (example at z4):

However, once we get zoomed in far enough it doesn't make sense to show a central point marker anymore (example at z18):

We could probably filter these out in MapLibre but the more efficient solution would be to exclude them from the tiles with a parameter like max_size.

[msbarry]

Interesting, this isn't a capability in the java API either - profiles just set a max zoom. So you would set max size to some number of "square pixels" or "square tiles"?

[quincylvania]

@msbarry The unit should probably match that of min_size, which I guess is pixels. Personally I find this unit a bit difficult to visualize and prefer a ratio more akin to that of min_tile_cover_size.

[quincylvania]

I'm realizing this is less useful than expected since we only render tiles up to z14.

[quincylvania]

With #979 we can now filter these client side. Filtering during render may still be useful to reduce tile size, but it's very low priority for us. Feel free to close this as wontfix if you don't see anyone else needing this feature.