feat: implement OnyxMoreList component

[larsrickert]

Relates to #986

Implement a generic OnyxMoreList component that can be used to render any list of components with a "+ more" indicator.
I will integrate it in following PRs into the nav bar as well as implementing the positioning of the more indicator which is currently not visible at all.

Checklist

• The added / edited code has been documented with JSDoc
• If a new component is added, at least one Playwright screenshot test is added
• A changeset is added with npx changeset add if your changes should be released as npm package (because they affect the library usage)

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