New Component: Accordion

[hakimelek]

An example from Rental Cars Checkout page:

[lauradhahn]

@odmln this might be an interesting one to explore from a design standpoint. We have different chevron placements throughout the site and they're all initiating different types of interactions. Some things to consider:

• Is a chevron the right indicator for an accordion interaction?
• Could the accordion behavior be applied to a number of different page elements?
• If so, what placement/indicator would be most flexible?

[jxnblk]

Fun fact

You can do this in GH-Flavored Markdown

[James300]

New Component: Accordion

[James300]

I'll wait until v4 for this since that is when we are doing the bump to hooks and it seems pointless to remake this component right after building it.

[sdalonzo]

FYI I created this component internally, and it could be promoted to the Design System as soon as we bump the React peer floor to support hooks.

[craigpalermo]

Blocked by #711