[VTK] Add axes coordinates to VTK view

[xavArtley]

First prototype of axes for VTK panel:

import panel as pn
import numpy as np

axes = dict(
    origin = [10, 0, -5],
    xticks = np.linspace(-10,10,5),
    yticks = np.linspace(0,12,11),
    zticks = np.linspace(-5,5,5),
)
dragon = pn.pane.VTK('https://raw.githubusercontent.com/Kitware/vtk-js/master/Data/StanfordDragon.vtkjs',
                     sizing_mode='stretch_width', height=400, enable_keybindings=True, orientation_widget=True,
                     serialize_on_instantiation=True, axes=axes)
dragon.show()

In the same time I restructure typescript code of VTK pane by splitting in smaller files in a repository specific to vtk

TODO:

• : grid opacity, axes opacity
• axes color, grid color
• : separate ticks position and ticks label (number and text)
• : add possibility to set tick label style properties (font
• : add listener on axes change
• : don't remove axes actor when panel object is changed
• : Add documentation

[philippjfr]

I wasn't aware that you could actually load dependencies like this yet. What ends up loading the dependency?

[xavArtley]

I suppose node and the typescript compiler to create the .js

[codecov]

Codecov Report

Merging #817 into master will decrease coverage by 0.16%.
The diff coverage is 79.16%.

@@            Coverage Diff             @@
##           master     #817      +/-   ##
==========================================
- Coverage   69.94%   69.77%   -0.17%     
==========================================
  Files         104      104              
  Lines       10463    10532      +69     
==========================================
+ Hits         7318     7349      +31     
- Misses       3145     3183      +38

Impacted Files	Coverage Δ
panel/models/vtk.py	100% <100%> (ø)	⬆️
panel/pane/vtk/vtk.py	28.45% <54.54%> (+1.93%)	⬆️

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[xavArtley]

[philippjfr]

Thanks for the PR! At some point we need to figure out how to test the Vtk code.