HHH-18274 generics generalized solution

[cigaly]

https://hibernate.atlassian.net/browse/HHH-18274

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[cigaly]

If this is violating compliance, then I was wrong from the very beginning :-( I've removed all commits except the one with new test class.

[cigaly]

Added new commit containing fix for binary and unary expressions. Now only tests with function call are failing.

[cigaly]

All tests passed, now I will apply suggested changes.

[cigaly]

All tests are now passing with exception of three (out of four) tests in org.hibernate.orm.test.mapping.converted.converter.ConvertedAttributesTypecheckTest. This will be fixed when pull request #8681 is merged.

[gavinking]

@cigaly @mbladel why is this one stalled?

[mbellade]

@gavinking I've lost track of this one, I had approved it and at its current state it still looks correct to me - I'll go ahead and merge once CI passes, thanks for reminding me.