Need a way to check if an axis minor or major grid is on #19021
Description
It appears we have no public interface to check whether the grid is on? Downstream libraries are now replacing the private self.xaxis._gridOnMinor with the private self.xaxis._minor_tick_kw["gridOn"], which seems even worse.
Seems we need self.xaxis.grid_on(which='minor') and self.xaxis.grid_on(which='major')?
Originally posted by @jklymak in #18769 (comment)