Convert a native Giotto object into a new Seurat object.
Details
The bridge selects the GiottoClass v4 or v5 converter according to the installed Seurat major version. For round trips produced by [srt_to_giotto()], normalize the Seurat input first (for example with [Seurat::NormalizeData()]); the official GiottoClass converter records an empty normalized layer otherwise, which its reverse converter cannot read back.