[Modification Request] Add background image props to Hero component

[jjwinskill]

Many Primer Brand components, like Section and BreakoutBanner, follow a common pattern of accepting props that support a background image. We'd like to extend this pattern to the Hero component so we don't need a bespoke solution to using a background image with the Hero.

Specifically, would it be possible to add the following properties to the Hero component? (here I'm using packages/react/src/Section/Section.tsx for the sub types):

backgroundColor?: BackgroundColors | ResponsiveBackgroundColorMap
backgroundImageSrc?: string | string[] | ResponsiveBackgroundImageSrcMap
backgroundImagePosition?: string | string[] | ResponsiveBackgroundImagePositionMap
backgroundImageSize?: string | string[] | ResponsiveBackgroundImageSizeMap

This is similar to a separate request for the CTA banner #756