refactor(appstore): migrate to Typescript and Vue 3

[susnux]

• for 📦 ❗️Vue 3 Migration - Roadmap #55428
• resolves[Bug] Nextcloud 30 : Information not updating after update or installation (need to refresh page) #47637
• resolvesAn app store setting to "Hide untested apps" #48112
• resolvesApp tile is squished on search in Apps page #49423
• resolvesIn-app search in Apps management #49598
• resolves[Bug]: App list buttons layout is broken on small screens #49813
• resolvesGlobal search for apps #49869
• resolves[Bug]: Limit application to group list is incomplete and does not accept not listed groups #50231
• resolves[Bug]: Restrict app to a group menu isn't working properly #50543
• resolvesApp management: The "download and enable" button should be moved outside the sidebar tab #44125
• resolves[Bug]: No scrolling on apps page #44568
• resolvesApps management: Search happening in multiple places #23127
• resolves[Bug]: App screenshots are partly covered #36755
• resolvesApp store shows group gid instead of displayname when restricting access #37333
• resolvesLimit to groups selection broken for >~5 groups #39322

Summary

1. Split the settings app into settings + appstore to separate the means
2. Adjust router to allow the appstore app to register root URLs (to prevent breaking changes in the URLs)
3. Migrate appstore frontend to Typescript
4. Use Vue 3 for the appstore frontend

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)