feat: add support for Statamic 4

[stefangalescu]

❓ Type of change

• [ ] 📖 Content (updates to the content, documentation, API reference or README)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [x] 👌 Enhancement (improving an existing functionality, like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This PR adds support for Statamic 4.