Support CommaSeparatedTuples including commas

Created by: gcatanese

This PR improves the management of CommaSeparatedTuples to be able to support strings that include commas:

a,b,c,"1,2,3" -> [a][b][c][1,2,3]

When the value (ie "1,2,3") is quoted the commas are ignored and the (sub)list is considered a single value

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