3D canvas

[hanjinliu]

This PR implements 3D canvas for backends that support it.

[codecov]

Codecov Report

Attention: Patch coverage is 16.90418% with 1691 lines in your changes are missing coverage. Please review.

Project coverage is 77.56%. Comparing base (e6ca691) to head (a4468ca).

Files	Patch %	Lines
whitecanvas/canvas/canvas3d/_base.py	0.00%	248 Missing ⚠️
whitecanvas/layers/layer3d/markers.py	0.00%	165 Missing ⚠️
whitecanvas/layers/layer3d/vectors.py	0.00%	115 Missing ⚠️
whitecanvas/backend/vispy/components3d/axis.py	0.00%	88 Missing ⚠️
...ecanvas/backend/matplotlib/components3d/markers.py	0.00%	78 Missing ⚠️
...tecanvas/backend/matplotlib/components3d/canvas.py	0.00%	70 Missing ⚠️
whitecanvas/backend/vispy/components3d/canvas.py	0.00%	64 Missing ⚠️
whitecanvas/layers/_primitive/vectors.py	44.82%	64 Missing ⚠️
whitecanvas/backend/plotly/components3d/markers.py	0.00%	56 Missing ⚠️
whitecanvas/backend/pyqtgraph/vectors.py	32.09%	55 Missing ⚠️
... and 35 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
- Coverage   84.11%   77.56%   -6.55%     
==========================================
  Files         168      195      +27     
  Lines       19170    20966    +1796     
  Branches     3200     3408     +208     
==========================================
+ Hits        16124    16263     +139     
- Misses       2200     3855    +1655     
- Partials      846      848       +2     

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