TSL: Add support for array of varyings

[qtnrtnd]

Description

Currently, there is no way to create an array of varyings, unlike uniforms (e.g., uniformArray).
Here is a demo in GLSL for those who are not familiar with using varyings as arrays.

Solution

I believe a method very similar to uniformArray, which could naturally be called varyingArray, would be ideal.

Alternatives

I couldn’t find any alternative for what I did in the plain GLSL demo above.

Additional context

No response