feat(OnyxMoreList): implement more indicator

[larsrickert]

Relates to #986

Implement more indicator for OnyxMoreList. For local testing, run Storybook and open: http://localhost:6006/?path=/story/support-morelist--default

Checklist

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

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: cd1b7216a2d84c0de6c53533d94102301250ba4b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

| Name | Type | | ------------------------- | ----- | | sit-onyx | Major | | demo-app | Patch | | playground | Patch | | @sit-onyx/chartjs-plugin | Major | | @sit-onyx/nuxt | Major | | @sit-onyx/vitepress-theme | Major |

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