[DDC-2763] Inheritance. Improve lazy load associated entitities #1440
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[DDC-2763 92c1a8f] [DDC-2763] Inheritance. CTI & STI. Improve lazy load associated entity, when target entity in association mapping is not last leaf in class hierarchy.
Issue fixed by adding class "ProxyHydrator" and new fetch mode for associations "FETCH_USE_PROXY".
Users need to mark the associations with "fetch=USE_PROXY" to trigger new lazy loading behaviour.
This PR is not intended to be final. It still lacks of tests.