Adds date input example and adjusts baseline appearance

[anselmbradford]

Changes

• Adds date input example and adjusts baseline appearance

Testing

1. Check the date input on https://deploy-preview-2116--cfpb-design-system.netlify.app/design-system/components/text-inputs#date-input-1 in various browsers. On iOS it should have dimensions (not be a small square) and when a date is filled in, it should be vertically centered.

Screenshots

[netlify]

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