git-xet: Add version 0.2.0

[haussmann]

git-xet: Add version v0.2.0

• Can't use traditional Github checkver, because the repository contains releases for multiple different topics and no latest tag
• Main bucket criteria :
  • ⚠️ 393/500 stars, 51/150 forks, but I believe this is one of the main huggingface.com ways of downloading models, so quite popular
  • ⚠️ Only two versions ever released: 0.1.0 and 0.2.0
  • ✅ full version
  • ✅ simple cli binary only, portable install via unzip
• ⚠️ToDo
  • Tests necessary whether git xet install is required

Closes: #7516

• Use conventional PR title: <manifest-name[@version]|chore>: <general summary of the pull request>
• I have read the Contributing Guide

[github-actions]

All changes look good.

Wait for review from human collaborators.

git-xet

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• Description
• License
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• Checkver
• Autoupdate

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