tableObject should return both raw and formatted values, especially for dates format

[RomainVialard]

Currently it is possible in Data Studio to select a date type for a date dimension: https://support.google.com/datastudio/answer/7443530?hl=en

When using the standard Table visualization, dates are correctly displayed depending on the selected date type.

But in Community Visualizations, the tableObject contains a number (YYYYMMDD) for each date and no formatted value (actually it's not even a number but a string). It would be great if the table Object could contain both the raw date value and the formatted value for each date.

This is also true for currencies.

Note that we do get the selected date format in the headers contained in the tableObject but it forces all viz builders to implement their own date formatting logic when this could be part of dscc.

[RomainVialard]

In Google Charts, cells in a DataTable can contain 2 different properties:

• The cell value (The data type should match the column data type)
• A string version of the cell value, formatted for display. Typically the values will match, though they do not need to, so if you specify Date(2008, 0, 1) for cell value, you should specify "January 1, 2008" or some such string for this property. https://developers.google.com/chart/interactive/docs/reference#dataparam