feat(UTabs): Add `icon` slot

[abeldotam]

🔗 Linked issue

Resolve #1513

❓ Type of change

• [x] 📖 Documentation (updates to the documentation or readme)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [x] 👌 Enhancement (improving an existing functionality)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Adding an icon slot to the UTabs component, allowing user to making simpler for basic usecase and customizable for advance.

📝 Checklist

• [x] I have linked an issue or discussion.
• [x] I have updated the documentation accordingly.

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(Thanks @noook for showing/assigning me this issue 🫶)