Merge critical changes from Fusion Seed repo into main

[pzhanggit]

This is part of MATEY development within the fusion seed project IGNOS (https://github.com/FusionFM/, repos currently private). Major changes include:

• New fusion datasets: GkeyllTrajDataset, GraphXGCDataset, and SOLPSBaseDataset
• Model changes to handle graph partition with patching simultaneously
• Inference and visualization scripts as well as config files for fusion datasets
• Some bug fixing changes introduced from other ongoing dev branches

[TsChala]

I found a few minor issues here and there, but overall should be good. I remember seeing some of these changes already in the other branches.

[pzhanggit]

I found a few minor issues here and there, but overall should be good. I remember seeing some of these changes already in the other branches.

Thanks! Yes, see my description in the beginning - this PR changes from other branches that have not been merged into main yet, as they were needed for bug fixing etc... Hopefully, they would make our future merging easier. The new commit should've covered all your comments.

[TsChala]

There is one more location where the XGC reader is imported.

[TsChala]

Looks good now, thanks!