feat: Support authentication private pub

[VictorOhashi]

Description

Support authentication with private pub repositories.

Resolves: https://github.com/invertase/melos/issues/498

Type of Change

• [X] ✨ feat -- New feature (non-breaking change which adds functionality)
• [ ] 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ ! -- Breaking change (fix or feature that would cause existing functionality to change)
• [X] 🧹 refactor -- Code refactor
• [ ] ✅ ci -- Build configuration change
• [ ] 📝 docs -- Documentation
• [ ] 🗑️ chore -- Chore

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[VictorOhashi]

Good stuff! Just some minor comments about naming.

Thanks for the review. All fixed.