Add axes for object size and debug tick mark problems

[cmalinmayor]

Can use fastplotlib axes code for inspiration

• Configurable (from code) tick marks (lines, not circles) and number spacing with sensible defaults
• Axes numbering works in horizontal and vertical mode - currently no numbers except 0 when time is on the horizonal axis
• Feature axis has an actual axis with numbers and a configurable (from code) label

Axes remain on the view even when you pan/zoom (a.k.a they are "pinned" to the side of the window like the row/column labels in a spreadsheet viewer)

Bonus: the numbers and tick marks scale dynamically with the zoom level
Another bonus: Grid lines behind the data

Other notes about the axes: The configuration of which numbers to draw and the extent of the axis seem fragile currently. I somehow got the axis on the right at some point, and another time it only labeled 40 and 50 when the time axis actually went from 0 to 91. The number of time labels it draws varies as I click around (starts with 0, 25, 50, 75, ends with only 0 labeled).

[bjarthur]

feature axis added in be7b5fcba2f46c6b6bac213f7da4d711ee86b7e5

[bjarthur]

axes pinned to side of window in a8693ed451f0ac4b30267a79b2dc65867df13d37. it's a bit jerky. let me know what you think.

[bjarthur]

pinning works when flipped now: 2d2f81b
but the auto-tick position from pygfx are really messed up

[cmalinmayor]

Garg. I opened an issue in pygfx about the tick circles, perhaps we need another for the positions.

[bjarthur]

the axes in the fastplot lib examples are rock steady when panning. so there should be away to fix the jerky behavior.

[bjarthur]

pygfx/pygfx#1157