GLSL Benchmarking

[patriciogonzalezvivo]

Hi! currently we are in the middle of big rearchitecture of the PBR model and raymarching pipeline by @shadielhajj, so benchmarking is not high in the priority. But I started doing some work on that direction by adding benchmark to my GLSL lygia_examples repo

This is the first diff that incorporate it comparing the before and after merging this PR

Take a look to the README.md it condence all the difference patriciogonzalezvivo/lygia_examples@3f92c05#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5

This benchmarks are perform on a RaspberryPi CM 4 that have a V3D chip which is so limited that gives somehow consistent results.

The plan for LYGIA would be to have at least one test per file. The test are constructed from some meta data on the header of the file