[#74849038] pr comments addressed
[#77728418] add Subscrition#topics to return associated topic objects
Merge pull request #24 from HouseTrip/platform/implement-monitoring-endpoints-get-topics-74849038

Platform: Implement monitoring endpoints - GET topics [#74849038]
[#77728418] spec for subscription > topic cumulative totals
[#77728418] get subscriptions endpoint spec
Merge branch 'platform/implement-monitoring-endpoints-get-subscriptions-77728418' into staging