Add ORM EntityListener equivalent

[webdevilopers]

Original discussion started here:
https://twitter.com/webdevilopers/status/724872011638562816 @jmikola

Created Feature Request as suggested by @malarzm .

ORM implementation:
http://doctrine-orm.readthedocs.io/projects/doctrine-orm/en/latest/reference/events.html#entity-listeners

Domain-Driven Design use cases also discussed here:
webdevilopers/php-ddd#2

[stale]

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