WIP Add sql tests for ECDb

[rschili]

Prototype of a framework that will make it easier to compose a large amount of SQL tests which verify results (not just prepare and done).

This is currently very WIP and early. But the test format is mostly fleshed out so people can join and compose tests.
Part of a shared effort to increase our ECDb test coverage after recent breaks.

The picture separates our API into 9 areas which we can distribute among the team.

• 1 - Subquery, ClassName, MemberFunctionCall, TableValuesFunction(Naron)
• 2 - CommonTable Expressions (Soham)
• 3 - Properties, LimitOffset, Group by, Having, Where, SubqueryTest, AllOrAny (Rohit)
• 4- Joins(Naron)
• 5- Pragma and NavValueCreation
• 6 - Parameter, Boolean, Range (Akshay)
• 7- Literals, EnumValue, ExtractValue( Soham)
• 8 - Cast, PropertyNameList, SubqueryValue, IIF (Robert)
• 9 - Window Functions (Robert)