Added time as a uniform property for final shader

[RealEdwardS]

Describe your changes

Added time elapsed from the app start as a uniform property for final shader application.

time is stored as a double, however, there doesn't seem to be a SetUniform function for doubles (according to the docs - https://vtk.org/doc/nightly/html/classvtkUniforms.html), so I'm using SetUniformf.

Issue ticket number and link if any

#2257

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 .github/workflows/versions.json, I have updated docker_timestamp

Continuous integration

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[Meakk]

Nice straightforward implementation :)
You will have to add a simple test using time.