factor out function for structured grid dims workaround #215
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in lieu of an xarray index for structured grids to provide layer/row/column indexing on arrays even when they are defined in terms of nodes, we reshape flat arrays to structured grid dims in the converter for now. move this out into a function so it's more obvious it's temporary.
introduced by @mjreno in #196. I sullied that PR with all kinds of conflicts so pulling this in separately.