Fix DDC-2252
Document Parenthesis BC break.
Merge pull request #616 from FabioBatSilva/DDC-2252

[DDC-2252] Fix delete many-to-many composite key
Fix parenthesis example
Rework NativeSQL doc chapter and document SELECT clause generation (ref DDC-2055).
Second cache level POC
First round of refactory
Fix factory method name
refactoring region access tests
basically support for many to many collection
Refactoring tests
store cascade collections
refactoring collections store
handle one to many collections storage
tests put entities on persist
test one to many orphan removal