Add classmethod to read pvcc paraview

[beroda]

Overview

This PR implements a classmethod to pyvista.Camera that reads a Paraview camera file (.pvcc).

It looks like:

camera = pyvista.Camera.from_paraview_pvcc("file.pvcc")

See attached pvcc file as example (outputted with Paraview 5.10).

<PVCameraConfiguration description="ParaView camera configuration" version="1.0">
  <Proxy group="views" type="RenderView" id="6395" servers="21">
    <Property name="CameraPosition" id="6395.CameraPosition" number_of_elements="3">
      <Element index="0" value="10.519087611966333"/>
      <Element index="1" value="40.74973775632195"/>
      <Element index="2" value="-20.24019652397463"/>
    </Property>
    <Property name="CameraFocalPoint" id="6395.CameraFocalPoint" number_of_elements="3">
      <Element index="0" value="15.335762892470676"/>
      <Element index="1" value="-26.960151717473682"/>
      <Element index="2" value="17.860905595181094"/>
    </Property>
    <Property name="CameraViewUp" id="6395.CameraViewUp" number_of_elements="3">
      <Element index="0" value="0.2191945908188539"/>
      <Element index="1" value="-0.4665856879512876"/>
      <Element index="2" value="-0.8568847805596613"/>
    </Property>
    <Property name="CenterOfRotation" id="6395.CenterOfRotation" number_of_elements="3">
      <Element index="0" value="15.039424359798431"/>
      <Element index="1" value="-7.047080755233765"/>
      <Element index="2" value="6.712674975395203"/>
    </Property>
    <Property name="RotationFactor" id="6395.RotationFactor" number_of_elements="1">
      <Element index="0" value="1"/>
    </Property>
    <Property name="CameraViewAngle" id="6395.CameraViewAngle" number_of_elements="1">
      <Element index="0" value="30"/>
    </Property>
    <Property name="CameraParallelScale" id="6395.CameraParallelScale" number_of_elements="1">
      <Element index="0" value="20.147235678333413"/>
    </Property>
    <Property name="CameraParallelProjection" id="6395.CameraParallelProjection" number_of_elements="1">
      <Element index="0" value="0"/>
      <Domain name="bool" id="6395.CameraParallelProjection.bool"/>
    </Property>
  </Proxy>
</PVCameraConfiguration>

[codecov]

Codecov Report

Merging #3662 (b8b405e) into main (f5dbce8) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3662      +/-   ##
==========================================
+ Coverage   94.05%   94.06%   +0.01%     
==========================================
  Files          83       83              
  Lines       18558    18614      +56     
==========================================
+ Hits        17454    17510      +56     
  Misses       1104     1104              

[beroda]

It might be interesting to implement the possibility to output a .pvcc file such that:

camera = pyvista.Camera()
camera.to_paraview_pvcc("file.pvcc")

I will implement-it shortly.

[banesullivan]

Thank you for implementing this, @beroda! This PR has minimal impact on the rest of the code base and you've included excellent docstrings and tests, so I'm happy to merge this!