fix(StateEditor): add isPrimitive helper and support bigint type (#744)

[hichem-dahi]

🔗 Linked issue

fixes #744

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• [x ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 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

This PR introduces a isPrimitive utility function to clean up the type-checking logic in StateEditor, and adds support for bigint values as valid primitives.