FEAT: Add plot option for mesh

[koubaa]

Use new mechanical API to get the scenegraph for meshes and results

Add handling for line bodies, point clouds, arbitrary scenegraph structure, and MeshOrientedTransformNode (under an env var, it isn't correct)

To render a mesh:
app.plot(app.Model.Mesh)

To render a result:

app.plot(app.Model.GetChildren(DataModelObjectCategory.Result, True)[0])

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.03% (target: -1.00%)	✅ 40.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (c152a6c)	2544	2187	85.97%
Head commit (ebf3d10)	2545 (+1)	2187 (+0)	85.93% (-0.03%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1268)	5	2	40.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.93%. Comparing base (c152a6c) to head (ebf3d10).
⚠️ Report is 1 commits behind head on main.

❌ Your patch status has failed because the patch coverage (40.00%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1268      +/-   ##
==========================================
- Coverage   85.96%   85.93%   -0.04%     
==========================================
  Files          39       39              
  Lines        2544     2545       +1     
==========================================
  Hits         2187     2187              
- Misses        357      358       +1     

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[dipinknair]

@koubaa let me test this on examples.