fix(modelgrid): add more support for mf6 surface water models #2295
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New MODFLOW 6 surface water models (overland flow and channel flow) use two dimensional and one dimensional grids. This PR adds an elegant fix to allow the grids to work properly with these new grid types (DISV1D, DIS2D, and DISV2D). These new grids do not have "top" but do have a "bottom" array (not "botm"). Plan for the future is to split up VertexGrid and StructuredGrid to support other types of grids.