WIP: stochastic transparency support

[Meakk]

Describe your changes

Add support for stochastic transparency.
It's an alternative to the expensive depth peeling.
While it could be quite noisy, it's also way more efficient, and the noise can be reduce by SSAA or by the upcoming TAA.

Issue ticket number and link if any

#2236

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 timestamp

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