feat: Add a patterns to polygons

[manthey]

Polygons can now have a pattern style. This is mostly the same as marker styles:

• fillColor: RGBA fill color. Default is polygon strokeColor and strokeOpacity.
• strokeColor: RGBA stroke color. Default is polygon fillColor and fillOpacity.
• strokeWidth: The weight of the pattern marker's stroke in pixels. Set this or A on strokeFill to zero to not have a stroke.
• strokeOffset: The position of the stroke compared to the pattern radius. This can only be -1, 0, or 1 (the sign of the value is used).
• radiusIncludesStroke: If truthy or undefined, the radius includes the strokeWidth based on the strokeOffset. If defined and falsy, the radius does not include the strokeWidth.
• symbol: One of the predefined symbol numbers. This is one of geo.markerFeature.symbols.
• symbolValue: A value the affects the appearance of the symbol. Some symbols can take an array of numbers.
• rotation: The rotation of the symbol in clockwise radians.
• scaleWithZoom: This determines if the fill, stroke, or both scale with zoom. If set, the values for radius and strokeWidth are the values at zoom-level zero.
• rotateWithMap: If truthy, rotate symbols with the map. If falsy, symbol orientation is absolute.
• radius: Radius of each marker in pixels. This includes the stroke width if strokeOffset is -1, excludes it if strokeOffset is 1, and includes half the stroke width if strokeOffset is 0. Note that is radiusIncludesStroke is false, this never includes the stroke width.
• spacing: Spacing in pixels between pattern symbols; scaled if either radius or strokeWidth is scaled. If positive, patterns are on a square grid. If negative, patterns are on a triangular grid.
• origin: Origin of the pattern.