feat: add @primer/cli package

[joshblack]

Reference: https://github.com/github/primer/issues/7202

Changelog

New

Changed

Removed

Rollout strategy

• No changes needed in github/github-ui
• Needs changes in github/github-ui
• Ships with feature flag(s)
• Not sure
• None

Testing & Reviewing

[changeset-bot]

⚠️ No Changeset found

Latest commit: 5655177

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