Add a view-only mode to the Table Editor View (Step 3 of issue #1758)

[robyngit]

Setting viewMode: true when initializing the TableEditorView will deactivate the ability for users to edit table cell values, or add & delete rows and columns. The column sort functionality is maintained. e.g.:

new TableEditorView({
  csv: `ID,Fruit,Number
        1,Apple,123456
        2,Orange,234567
        3,Watermelon,345678`,
  viewMode: true,
});

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