feat [design]: ✨ add icon slot to sd-accordion

[mariohamann]

User Story

As a user of the Solid Design System, I would like to have a dedicated slot to place icons inside a sd-accordion.

Suggested Solution

Ideally the icon appears here, but of course vertically centered. This could help us especially in #1188

DoR

• Item has business value
• Item have been estimated by the team
• Item is clear and well-defined
• Item dependencies have been identified

DoD

• Brand approval (---> pending)
• 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
• Published in Figma and communicated in release notes
• Issues for dependencies have been created (if neccessary)

[mariohamann]

@MartaPintoTeixeira Would you mind making a little PoC in a separate branch for sd-accordion?

We would need a boolean property which enables a slot which contains an icon. For comparison, check out how we've done it in sd-button.

[yoezlem]

@mariohamann @karlbaumhauer We only needed this feature to find a smooth solution for sd-quickfact, right? Since we now have a solution for that, do we still need this feature in sd-accordion? Otherwise, I would like to close the ticket.

[mariohamann]

@coraliefeil Maybe you can have a look but we close it for the moment. :)