Add Hash source support to CsvBuilder::Builder

What does this MR do and why?

This MR allows passing an array of Hash values to CsvBuilder::Builder in order to export it to CSV. It refactors the test structure so that it is more amenable to accept a new scenario.

Screenshots or screen recordings

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n/a

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

The unit tests should be enough.

MR acceptance checklist

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