consider renaming AUTH GROUP and AUTH ZGROUP

[abap-weasel]

Please consider renaming objects GROUP (uses SAP-owned namespace) and ZGROUP (we already have that name used in our system) with prefix like "adf"

• https://github.com/microsoft/ABAP-SDK-for-Azure/blob/master/src/zrest/group.auth.xml
• https://github.com/microsoft/ABAP-SDK-for-Azure/blob/master/src/zrest/zgroup.auth.xml