GeoJSON specification RFC 7946 conformity

[kuanb]

Per updated GeoJSON spec: https://datatracker.ietf.org/doc/html/rfc7946#section-3.1.6

Polygon specification now indicates:

A linear ring MUST follow the right-hand rule with respect to the
      area it bounds, i.e., exterior rings are counterclockwise, and
      holes are clockwise.

Problem:
mercantile utilizes clockwise pattern which is the inverse of specified counter-clockwise pattern for polygon feature creation.

Impacted LoC:

mercantile/mercantile/__init__.py

Line 835 in fe3762d

[[west, south], [west, north], [east, north], [east, south], [west, south]]

Short term workaround for my use case:

def as_geom(qk: str):
    t = mercantile.quadkey_to_tile(qk)
    west, south, east, north = mercantile.bounds(t)
    return {
        "type": "Polygon",
        "coordinates": [[
            [east, north],
            [west, north],
            [west, south],
            [east, south],
            [east, north],
        ]],
    }