mint::Mesh unnecessarily requires coordinate arrays to be 2D (Nx1) arrays

[gunney1]

There may be a real reason for the requirement, but it is in excess of the Blueprint mesh convention. The requirement may be related to storing the 1D arrays in MCArray, which is deprecated. Maybe we should store them as axom::Array and remove the 2D requirement. That is, if the change doesn't break anything.

[gunney1]

MR #1459 adds reshaping to sidre::View, so we can reshape the data to satisfy the mint::Mesh requirement. However, we may still want to consider removing the requirement if it is outdated.