[APPS-1716] Add Brand resource

:koala: :+1: 

Add the Brand resource

/cc @zendesk/quokka @steved555 

### References
 - Jira link: https://zendesk.atlassian.net/browse/APPS-1716

### Risks
 - Live tests could fail on accounts without the resource enabled
I think it's a typo, should be :brands