Remove extra arguments from WCSAxes draw() methods #12672

In Matplotlib every draw() method has a two arguments, self and renderer. In WCSAxes this is not the case however, and there are frequently other arguments to draw(). This causes at least a couple of issues when interacting with Matplotlib, most recently #12568. It also reduces legibility of the code in my opinion - drawing an object should only rely on the state of that object at draw time, not any extra parameters.

I am therefore in the process of refactoring WCSAxes to remove extra arguments to the draw() methods. This is going to require quite a bit of surgery, so I'm opening this issue to track the progress I make and PRs I open.

draw() methods that need fixing:

• TickLabels.draw() (Allow WCSAxes ticklabels to be rasterized #14760)
• AxisLabels.draw() (https://github.com/dstansby/astropy/tree/wcsaxes-axislbl-draw)
• WCSAxes.draw() (Remove kwargs from WCSAxes.draw() #14772)
• _WCSAxesArtist.draw() (Remove kwargs from WCSAxes.draw() #14772)

PRs opened:
(note: these are all based on top of each other, so the order matters)

1. Calculate WCSAxes TickLabel pixel coords at draw time #12630
2. Deprecate getting/setting pix on WCSAxes Spine #13989
3. Allow WCSAxes ticklabels to be rasterized #14760
4. https://github.com/dstansby/astropy/tree/wcsaxes-axislbl-draw