Add UxDataArray.data_location

[erogluorhan]

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Need to provide an enum or similar structure to indicate where data is stored in an UxDataArray.

UxDataArray.data_location: enumeration {“vertex_centered”, “face_centered”, “face_average”, “edge_centered”, “edge_orthogonal”, “edge_parallel”, “cgll”, “dgll”}

cgll/dgll: Continuous/Discrete Gaussian. Polynomial order of data may also need to be provided when using “cgll” or “dgll”.

Additional context Currently there are internal functions UxDataArray._face_centered() and UxDataArray._node_centered() that work with simply checking the dimensions of data array and return boolean values, which are used for visualization purposes. This effort should address all the need listed above.