onDelete for joinColumns

[chapterjason]

Make it possible to configure what happens if the user will get deleted:

https://github.com/SoureCode/DoctrineExtensionBundle/blob/e714bb560d11d4c7ffc38d8a38ff925c701bdd0f/src/EventListener/BlameableListener.php#L77C3-L77C69

Example:

->addJoinColumn('created_by', 'id', nullable: false, onDelete: 'CASCADE')

->addJoinColumn('updated_by', 'id', nullable: true, onDelete: 'SET NULL')