unionMembers
Create the requested data set, a union of the cached and un-cached data.
    connection.unionMembers(set, diff, neededData, cachedData)
  
  Uses unionMembers to merge the two queries of data (neededData & cachedData).
Parameters
- query {Query}:The parameters of the data set requested. 
- diff {Object}:The result of getDiff. 
- neededData {ListData}:The data loaded from the base connection. 
- cachedData {ListData}:The data loaded from the cacheConnection. 
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