Introduce `room-building-name` as standard property for rooms for resource providers

[odzhychko]

Is your feature request related to a problem? Please describe.

Background

There are cases where multiple buildings share a common address. I guess this is especially common for school, colleges and campuses in general.

The FernUni hagen has a real world example of this: On "Universitätsstraße 33, 58084 Hagen" there is the building "Kultur- und Sozialwissenschaften" and the building "Seminargebäude".

Problem

Currently only room-building-address is exposed which

• might not contain the building name
  • maybe the building is encoded in the room-building-room-number or room-building-story'
• might contain it in different ways
  • e.g. Universitätsstraße 33, 58084 Hagen, (Seminargebäude)
  • e.g. Seminargebäude, Universitätsstraße 33, 58084 Hagen

Resource providers like https://github.com/nextcloud/calendar_resource_management and https://github.com/nextcloud/RoomVox have currently no common property to declare the room building unambiguously.

Describe the solution you'd like

Use a common field for for the building name e.g. {http://nextcloud.com/ns}room-building-name

Describe alternatives you've considered

Have heuristics to guess the building name from room-building-address, room-building-room-number etc.

Additional context

Open question, on which level to standardize {http://nextcloud.com/ns}room-building-name:

1. Only directly in

   calendar/src/models/principal/principal.ts

   Line 18 in fb819ae

   function mapDavToRoomPrincipalProperties(dav: Record<string, unknown>): RoomPrincipalProperties {

2. Only directly in https://github.com/nextcloud/cdav-library/blob/0e1a08573ed05340fe6c0b592976fe3feeb983f1/src/models/principal.js#L64
3. https://github.com/nextcloud/server/blob/942af7238a02731fcee3de148131d7d92dfa52c6/lib/public/Calendar/Room/IRoomMetadata.php#L19
   • Thought by me in feat(principal): map CalDAV room metadata properties #8263 (comment)
   • And opend as PR in feat(dav): add IRoomMetadata::BUILDING_NAME server#63244

Related cleanup

• remove deriveBuildingName code
  • fallback to full roomBuildingAddress if no building name is given

[odzhychko]

Thsi feature is now implement cdav-library and calendar_resource_mangment and used since #8731 in Calendar