Enable MetaDrive support on macOS

[DhlinV]

What changes do you make in this PR?

• Please describe why you create this PR
  Make the system work on macOS. Based on the commit from: https://github.com/commaai/metadrive/pull/6

Checklist

• I have merged the latest main branch into current branch.
• I have run bash scripts/format.sh before merging.
• Please use "squash and merge" mode.

[QuanyiLi]

Everything looks good to me. The only change could be done is that using is_mac() to determine when the anisotrophic degree should be 1, 8 or 4 is needed for other platforms.

[QuanyiLi]

Please fix the test before merging. Also, I found the depth camera is unavailable, as the compute shader requires openGL>4.3. This affects not only MacOS but other platforms with lower GL versions.

We should consider implementing a new depth camera

[QuanyiLi]

I also found the failed test is due to the DepthCamera. Just ignore it and let's fix it in next PR

[pengzhenghao]

The failed test might due to the depth cam... The Github CI has some problems when you run two tests on depth cam... So just ignore those tests for now.