Fixed issues in Doctrine Helper

Bugs from previous versions and the version in which they were fixed. Open issues are on the Open issues page.

AbstractEnumType is incompatible with DBAL 4

Symptom. With doctrine/dbal 4 a subclass of AbstractEnumType did not load:

Fatal error: Declaration of Ufo\DoctrineHelper\DBAL\AbstractEnumType::convertToDatabaseValue($value, ...)
must be compatible with Doctrine\DBAL\Types\Type::convertToDatabaseValue(mixed $value, ...): mixed

Cause. In 1.0.0 convertToPHPValue() and convertToDatabaseValue() had no return type, while the corresponding Doctrine\DBAL\Types\Type methods in DBAL 4 declare one.

Fix. 1.0.1 declares convertToPHPValue(mixed $value, AbstractPlatform $platform): mixed and convertToDatabaseValue(mixed $value, AbstractPlatform $platform): string|int.