Embedded objects are mostly ignored in QBE queries

[mipo256]

When investigating the #1986, I discovered that the embedded objects are not even considered during QBE to CriteriaDefinition conversion.

Here is the sample repo (MRE) that demonstrates the problem, the very specific test.

In the example, the ignoreCase setting is ignored. Other settings like the null handling for embedded properties described in #1986 are ignored as well.

The reason why it happens is that the algorithm in the RelationalQueryMapper only considers direct properties of an aggregate, meaning the property.getName() of direct properties is analyzed, but not deeper not recursive.

So the problem is far deeper, I'll handle it myself as well.

CC: @schauder @mp911de