Add support for multidimensional data in data viewer

[joyceerhl]

• Modify vscodeGetDataFrameRows to convert extra dimensions to strings
• Truncate long values UI side
• When user clicks into a cell, display the full flattened element

[joyceerhl]

To validate this one please open manualTestFile.py and verify that you can open myTensor in the data viewer via the following avenues (all of the following should work):

1. Variable view
2. Debugging cell in interactive window
3. Debug current Python file --> debug variables panel --> View Variable in Data Viewer

Initially, data >7 characters in length should be displayed with an ellipsis truncating the overflowing text. When you resize the columns the columns should update to show more of the data. When you click into a cell you should be able to scroll horizontally to view the full value with the left and right arrows, but the cell should be readonly--you should not be able to enter any keys and have them update the cell content.

Please also validate that you can open ragged numpy arrays and tensors (i.e. where the 2nd or 3rd dimensions have a variable number of elements between rows)

[rchiodo]

Validated