[ri-cloud-api]: Add grid data from sumo using api (#14653)

Add grid data from Sumo using ri-cloud-api

Load Eclipse grid data (roff) from Sumo as RimReservoirGridEnsemble, one case per realization, with async fetch of grid properties per timestep.

- New: RiaSumoGrid (transport), RifReaderSumoGridProperty (lazy property reader), RimReservoirGridEnsembleSumo, RimRoffCaseSumo, and a "Create Reservoir Grid Ensemble" command.
- Shared grid: IJK dimensions compared before download; one RigMainGrid is reused across the ensemble when they match, each realization still parses its own ACTNUM before releasing geometry.
- Rename folders: Summary/Sumo -> Summary/Cloud, RimSumoDataSource -> Cloud/ (PDM keywords unchanged, old project files still load).
- UI: cloud data sources also shown in the 3D window's Data Sources dock.
- Fix: realizations no longer lost on project reload; realizations missing data are now reported instead of silently skipped.

ApplicationLibCode/UserInterface/RiuViewer.h

@@ -92,6 +92,11 @@ public:
     void showFilterLabel( bool enable );
     void setFilterText( const QString& text );
 
+    // A banner across the top of the view, for telling the user data is on its way. Deliberately not the
+    // info text, which is small, in a corner, and can be switched off.
+    void showLoadingLabel( bool enable );
+    void setLoadingText( const QString& text );
+
     void showHistogram( bool enable );
     void setHistogram( double min, double max, const std::vector<size_t>& histogram );
     void setHistogramPercentiles( double pmin, double pmax, double mean );
@@ -187,6 +192,9 @@ private:
     QLabel* m_filterLabel;
     bool    m_showFilterLabel;
 
+    QLabel* m_loadingLabel;
+    bool    m_showLoadingLabel;
+
     caf::QStyledProgressBar*  m_animationProgress;
     caf::QStyledProgressBar*  m_animationProgressCompView;
     bool                      m_showAnimProgress;