Add support for grid calculations as data source for statistics

- add data source selection, either Case Property or Grid Calculation
- add Time Step Selection, can be used for both dynamic case properties and Grid Calculations
- optionally release grid calculation data when statistics is computed
- recursive grid calculations is supported

ApplicationLibCode/ProjectDataModel/RimGridCalculation.h

@@ -49,11 +49,13 @@ public:
 
     bool preCalculate() const override;
     bool calculate() override;
+
     void updateDependentObjects() override;
     void removeDependentObjects() override;
 
     std::vector<RimEclipseCase*> outputEclipseCases() const;
     RigEclipseResultAddress      outputAddress() const;
+    bool calculateForCases( const std::vector<RimEclipseCase*>& calculationCases, std::optional<std::vector<size_t>> timeSteps );
 
     std::vector<RimEclipseCase*> inputCases() const;