Split expression for group by into parts for DBMS that don't inline parameters

[beikov]

Currently, we assume when a DBMS supports complex group by expressions, that it also looks into the parameter values, but when we have an expression with a parameter, at least PostgreSQL can't see that the parameter value is the same as in the select clause resulting in an error. We have to introduce a DbmsDialect property and consider that during expression splitting for group by.