Improve mac unity setup steps

[AndrewKahr]

Changes

• Installs additional modules
• Ensures unity hub is installed in addition to editor

Checklist

• [x] Read the contribution guide and accept the code of conduct
• [x] Readme (updated or not needed)
• [x] Tests (added, updated or not needed)

[github-actions[bot]]

[codecov-commenter]

Codecov Report

Merging #501 (99f30a8) into main (584c036) will not change coverage. The diff coverage is n/a.

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  Lines        2890     2890           
  Branches      582      582           
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  Hits         1065     1065           
  Misses       1688     1688           
  Partials      137      137