Implement the Vine File schema class

[lubiah]

🔗 Linked issue

This pull requests fixes #101

❓ Type of change

• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [x] ✨ New feature (a non-breaking change that adds functionality)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This pull requests create a new VineJS schema.

This enables users to validate File instances.

Resolves #101

📝 Checklist

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