Metal debug render tests

[alexcristici]

Current status - 4 failing render tests:

• 2 will be fixed after triangulated lines will support data driven properties:
  render-tests/fill-outline-color/zoom-and-property-function
render-tests/fill-outline-color/property-function

• 2 are failing because of the layer z-fighting #1847:
  render-tests/text-pitch-alignment/map-text-depthtest
render-tests/fill-extrusion-color/function

[github-actions]

Bloaty Results 🐋

Compared to main

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  -0.0%    -184  +0.0%      +4    TOTAL

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/bloaty-results/pr-1855-compared-to-main.txt

Compared to d387090 (legacy)

    FILE SIZE        VM SIZE    
 --------------  -------------- 
   +18% +21.4Mi  +399% +23.9Mi    TOTAL

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/bloaty-results/pr-1855-compared-to-legacy.txt