Merge o-expandable__padded into default and create new o-expandable__padded variant

[anselmbradford]

Changes

• Merge o-expandable__padded into default and create new o-expandable__padded variant

Testing

1. There is a new padded expandable on https://deploy-preview-1924--cfpb-design-system.netlify.app/design-system/components/expandables. The other expandables should be unchanged.

Screenshots

[netlify]

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😎 Deploy Preview	https://deploy-preview-1924--cfpb-design-system.netlify.app
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[csebianlander]

If we can modify the styling so the padding's also applied to the toggle icon (to get it roughly vertically centered) I think this will work perfectly.

[anselmbradford]

If we can modify the styling so the padding's also applied to the toggle icon (to get it roughly vertically centered) I think this will work perfectly.

Updated in 9675849

Screenshot above has also been updated

[anselmbradford]

Slight update to remove the left-hand padding to align with https://www.consumerfinance.gov/learnmore/