Feat: Add default_response option in plugin-survey-likert

[ethanknights]

Hi

To save time in certain paradigms, I found myself wanting to add a default response to Likert values -

This PR proposes to add the default_response optional argument so that scale values are pre-selected.

A couple of tests around this are added & are passing in npm test with jest.

[changeset-bot]

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Latest commit: a3db733

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