`scale_pattern_fill_gridpattern()`

[trevorld]

• There are a bunch of {ggpattern} pattern_fill color scales e.g. scale_pattern_fill_brewer(), scale_pattern_fill_distiller(), scale_pattern_fill_gradient(), scale_pattern_fill_grey(), scale_pattern_fill_hue(), scale_pattern_fill_viridis(), ...
• Now that {ggpattern} support pattern pattern_fill values should we provide scale(s) of {gridpattern} patternFill() pattern fills?
• We may want a variety of these...?