• Places axes positions based on the bbox of the tick labels text. Uses a private method from as described in Map Text boundaries to world bounding box if Text is in screen space pygfx/pygfx#967 (comment) , but I think that's fine at least for now.
• axes labels, subplot.axes.x.label.set_text("..."), label is just a pygfx.Text object, placed at the midpoint of the current visible extent of the corresponding axis, works with perspective projections as well.
• axes docs
• new subpackage, fastplotlib.axes which has the axes module, cleaner, prevents circular imports which occur when placed in fastplotlib.tools.
• needed to do some non-axes related cleanup, moved some stuff fastplotlib.utils to fastplotlib.graphics.utils, in order to get the API docs to auto generate.

LLM usage disclosure: I used claude for the _update_label() method, too lazy to work out the geometry but it seems right.

No performance impact (tested with spinning spiral example)

@cwindolf