Extend the existing benchmark framework to support the compositor.
Files are added separately.
Example output:
```
$ ./benchmark.py run comp
4.5 main
ghosts 1.2055s 1.0243s
ghosts 1.4936s 1.0454s
ghosts 0.4414s 0.4330s
file:///Users/habib/blender-git/benchmark/comp/results.html
```
Pull Request: https://projects.blender.org/blender/blender/pulls/136600