feat: add ICloudIdResolver

[susnux]

• copy of Add cloud id resolver interface #52993

Summary

An application requires group ids that contain slashes and colons. Full reasoning given:

Cloud Ids consist of username and remote parts. Usernames can also be group names. Federated groups are required to have "prefixes" to distinguish them from regular groups. Here group ids (gids) are written as Uniform Resource Names (URNs) that have colons and slashes as part of the uri scheme. We need to allow these characters as part of group names. Keep in mind that groups in Nextcloud can already contain these characters anyway.

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)

[smesterheide]

Hi @susnux, thanks for applying the changes and finalizing the PR. Is there anything else for me to do?