[2.0][DDC-354][DDC-425] Fixed. Encapsulated SQL logging better in the DBAL. Added binding types to DBAL mapping types as well as using these binding types in the persisters. Query and NativeQuery now support PDO binding types as well as DBAL mapping types when binding parameters.

DDC-127 - Enhance IterableResult by making it implement the Iterator interface, wrote a unit-test for this scenario, also added some additional tests for special cases in the query api that lead to exceptions.