added support for list positioning

[MelSumner]

📌 Summary

If merged, this PR adds support for @listPosition so that users can indicate how they want the list positioned. Default position is to the right; if @listPosition="left" is added when invoking the component, the list will be positioned on the left.

I used a string value instead of a boolean because it gives us future flexibility (i.e., adding top (left/right) and bottom (left/right) variations).

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• +1 Percy if applicable
• Confirm that PR has a changelog update via Changesets if needed

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