Analyse retained heap after bootstrap to trim memory consumption

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I've been running Eclipse MAT to query the state of the heap retained by a just-started SessionFactory, and found several objects which can be trimmed at minimal effort and risk.

The impact on memory saving are quite good and don't need significant rework; I'm not planning significant changes other than low-hanging fruits, so to also learn what could be done even better in Hibernate ORM 6.

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Created November 1, 2020 at 9:59 PM
Updated November 1, 2020 at 10:19 PM
Resolved November 1, 2020 at 10:15 PM