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.
Read the ROFF "subgrids.nLayers" array and expand it into a 1-based per-cell integer property (SUBGRIDS) so ROFF zonation becomes a regular grid property. If a companion "subgrids.names" array is present, zone names are surfaced as category code-names via the existing color-legend flow.
Magne Sjaastad
Jørgen Herje