Feat(REST API): add url to (un)archive cards

[xyjonas]

• Resolves: (Un)Archive cards programmatically via REST API #6132
• Target version: main

Summary

I implemented two new routes /api/v{apiVersion}/boards/{boardId}/stacks/{stackId}/cards/{cardId}/archive & /api/v{apiVersion}/boards/{boardId}/stacks/{stackId}/cards/{cardId}/unarchive, that will archive/unarchive cards via cardService. Documentation and unit tests are also included.
Please review my work and let me know what you think.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Documentation (manuals or wiki) has been updated or is not required

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[juliusknorr]

Thanks for your pull request and sorry for taking so long to review. Generally this seems good to me. However since this is a new endpoint we need to bump the API version so that clients can detect if the new API endpoint is actually available in https://github.com/nextcloud/deck/blob/fix/nextcloud-30-design-issues/lib/Capabilities.php#L39

[luka-nextcloud]

@juliushaertl The PR looks good to me, can we merge it?