Allow Custom ORMPurger

[kissifrot]

doctrine/DoctrineFixturesBundle#307 on Bundle-side allowed to create custom Purger, however an instance of ORMPurger is needed.
This PR allows a new ORMPurgerInterface to be used instead.

[kissifrot]

@alcaeus However CI complains about Interface suffix, however all other interfaces are sufixed, what should I do?

[alcaeus]

Since we can't rename the ORMPurger class, it's fine to add another exception for the new ORMPurgerInterface in phpcs.xml.dist:

data-fixtures/phpcs.xml.dist

Line 42 in 265b209

<exclude-pattern>lib/Doctrine/Common/DataFixtures/Purger/PurgerInterface.php</exclude-pattern>

[kissifrot]

Since we can't rename the ORMPurger class, it's fine to add another exception for the new ORMPurgerInterface in phpcs.xml.dist:

data-fixtures/phpcs.xml.dist

Line 42 in 265b209

<exclude-pattern>lib/Doctrine/Common/DataFixtures/Purger/PurgerInterface.php</exclude-pattern>

Done :)

[alcaeus]

Thanks @kissifrot!