Add SPZ support

[Meakk]

Describe your changes

Adds support for .spz gaussians splatting

Issue ticket number and link if any

#38

Checklist for finalizing the PR

• I have performed a self-review of my code
• I have added tests for new features and bugfixes
• I have added documentation for new features
• If it is a modifying the libf3d API, I have updated bindings
• If it is a modifying the default versions, I have updated timestamp

Continuous integration

Please check the checkbox of the CI you want to run, then push again on your branch.

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[mwestphal]

Good proto !

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 129 lines in your changes missing coverage. Please review.

Project coverage is 94.78%. Comparing base (5bc536c) to head (f20520f).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
plugins/native/module/vtkF3DSPZReader.cxx	0.00%	126 Missing ⚠️
plugins/native/module/vtkF3DSPZReader.h	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2180      +/-   ##
==========================================
- Coverage   95.88%   94.78%   -1.10%     
==========================================
  Files         127      129       +2     
  Lines       11118    11247     +129     
==========================================
  Hits        10661    10661              
- Misses        457      586     +129     

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[mwestphal]

Running coverage without writing tests make review impossible ^^

[mwestphal]

need some tests and doc obv :)

[Meakk]

Suggested change

	<comment>Niantic 3D Gaussians</comment>
	<comment>Compressed 3D gaussian splats</comment>

[github-actions]

Some suggestions could not be made:

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[github-actions]

Suggested change

	sh[i] = constant<M,L>() * unquantize(packed[offset + i]);
	sh[i] = constant<M, L>() * unquantize(packed[offset + i]);

[github-actions]

Suggested change

	sprites.Mapper->SetSplatShaderCode("//VTK::Color::Impl\n"
	" float dist2 = dot(offsetVCVSOutput.xy,offsetVCVSOutput.xy);\n"
	" float gaussian = exp(-0.5*dist2);\n"
	" opacity = opacity*gaussian;\n"
	" if (random(gl_FragCoord.xyz) >= opacity) discard;\n"
	" opacity = 1.0;\n");
	sprites.Mapper->SetSplatShaderCode(
	"//VTK::Color::Impl\n"
	" float dist2 = dot(offsetVCVSOutput.xy,offsetVCVSOutput.xy);\n"
	" float gaussian = exp(-0.5*dist2);\n"
	" opacity = opacity*gaussian;\n"
	" if (random(gl_FragCoord.xyz) >= opacity) discard;\n"
	" opacity = 1.0;\n");