feat: Implement base and mktg card components

[ChesneyJulian]

This PR includes a base card component which contains structural layout for a card header and body as well as parameters for @ isClickable and @ onClick.

There is a mktg/card component that has a @ horizontal parameter to determine orientation. Vertical orientation will be default since that is most commonly seen in the mock-ups. It also contains named yield blocks of callout, start, and end as well as a parameter for leftAlignCallout on the vertical orientation.

[Thomas-Jean]

We would like to try to combine the horizontal component and vertical component and use the @vertical flag to simplify the component API. We are going to break out the <:start> and <:end> slots for the content where start is the top or left element and end is the bottom or right element. We also want to extract the price logic out and have a <:callout> slot and an argument for callout alignment.

[ChesneyJulian]

We would like to try to combine the horizontal component and vertical component and use the @vertical flag to simplify the component API. We are going to break out the <:start> and <:end> slots for the content where start is the top or left element and end is the bottom or right element. We also want to extract the price logic out and have a <:callout> slot and an argument for callout alignment.

This is done now!