3.0.0

This package now focuses only on object creation by adding easy-to-use casting and data validation functionality. All runtime type checks are gone in favour of the improved type system in PHP 8.

• Require php:^8.0
• Removed all runtime type checking functionality, you should use typed properties and a static analysis tool like Psalm or PhpStan
• Removed Spatie\DataTransferObject\DataTransferObjectCollection
• Removed Spatie\DataTransferObject\FlexibleDataTransferObject, all DTOs are now considered flexible
• Removed runtime immutable DTOs, you should use static analysis instead
• Added Spatie\DataTransferObject\Validator
• Added Spatie\DataTransferObject\Validation\ValidationResult
• Added #[DefaultCast]
• Added #[CastWith]
• Added Spatie\DataTransferObject\Caster
• Added #[Strict]