Domain Group API Set

[nichujie]

Create a new API set called Domain Group.

This is used for any APIs involved in 2 domains:

• Clone problems
• List domains with same tags
• List problems in domains with same tags
• Problem group
• ...

The basic rules of this API set are:

• There should be 2 domain id in Path: e.g. /domains/{domainA}/with/{domainB} (with can be changed)
• permissions expand from domainA to domainB
  • The user send request from domainA to request some resources related to domainB.
  • If user has permission in domainA, we assume it to have same permission in domainB.