[feat] `<rh-announcement>`element

[mfwells]

Description

Create an Announcement banner element with the primary use for promotions at the top of a website.

Acceptance Criteria

• [x] Design done
• [ ] Development done

Image

Link to design doc

https://www.figma.com/design/0z0OyR7NHF90LPyjT3y4XX/Personalization-patterns-v2?node-id=0-1&t=trKI2WECpLXlls8i-0

Other resources

No response

[coreyvickery]

Update 5/22: Kicked off and answered some questions for Michael.

[coreyvickery]

@mfwells @alypilkons Where are we with development?