HHH-19364 partially-detached version

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Usage looks like:

var books = 
        SelectionSpecification.create(factory, Book.class)
                 .addRestriction(Restriction.like(Book_.title, "%Hibernate%", false))
                 .addRestriction(Restriction.greaterThan(Book_.pages, 100))
                 .setOrder(Order.desc(Book_.title))
                 .createQuery(session)
                 .getResultList();

Alternatively, I can take the concept further, get rid of the factory argument to create(), and do all the work in createQuery(). Depends which you prefer @sebersole.

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https://hibernate.atlassian.net/browse/HHH-19364

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#10050 won the competition!