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2eac8318f8
* introduces `UnionQuery` * some changes to enable a `UnionQuery` to have multiple input datasources * `UnionQuery` execution is driven by the `QueryLogic` - which could later enable to reduce some complexity in `ClientQuerySegmentWalker` * to run the subqueries of `UnionQuery` there was a need to access the `conglomerate` from the `Runner`; to enable that some refactors were done * renamed `UnionQueryRunner` to `UnionDataSourceQueryRunner` * `QueryRunnerFactoryConglomerate` have taken the place of `QueryToolChestWarehouse` which shaves of some unnecessary things here and there * small cleanup/refactors