feat(core/list): Implement generic list component

[lzeiml]

EIX-65
Docs PR: siemens/ix-docs#279

Add ix-list, ix-list-item and ix-list-separator.
Implements the following functionality:

• Keyboard navigable list with standard/custom content
• Checkbox selection
• Variants
• Dividers/spacing
• Action slot (persisent/on-hover)
• Drag and Drop (dynamic/separator)

🏁 Checklist

A pull request can only be merged if all of these conditions are met (where applicable):

• 🦮 Accessibility (a11y) features were implemented
• 🗺️ Internationalization (i18n) - no hard coded strings
• 📲 Responsiveness - components handle viewport changes and content overflow gracefully
• 📕 Add or update a Storybook story
• 📄 Documentation was reviewed/updated siemens/ix-docs
• 🧪 Unit tests were added/updated and pass (pnpm test)
• 📸 Visual regression tests were added/updated and pass (Guide)
• 🧐 Static code analysis passes (pnpm lint)
• 🏗️ Successful compilation (pnpm build, changes pushed)

[changeset-bot]

🦋 Changeset detected

Latest commit: a58cca8

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

This PR includes changesets to release 5 packages

Name	Type
@siemens/ix	Minor
@siemens/ix-react	Minor
@siemens/ix-angular	Minor
@siemens/ix-vue	Minor
@siemens/ix-docs	Minor

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud