feat[design]: Document and add duration token to sd-carousel

[yoezlem]

Description

This tasks describes the Figma implementation for: #2604

• Update Motion Page
• Update Docs / Variations Page
• Add tokens

DoR

• Item has been estimated by the team
• Item dependencies have been identified and documented

DoD

• Brand approval (if neccessary)
• Figma documentation file incl. hand-off has been created/updated (if applicable)
• Tokens have been applied/updated (if applicable)
• Crosslinks are created/updated
• Implementation works successfully on figma branch