Method ExecuteTreeGroupByAsync<TProps>(TreeQueryContext<TProps>, IEnumerable<GroupFieldRequest>, IEnumerable<AggregateRequest>)

Execute GROUP BY on tree with CTE.
Returns JSON string with grouping results.

public Task<string> ExecuteTreeGroupByAsync<TProps>(TreeQueryContext<TProps> context, IEnumerable<GroupFieldRequest> groupFields, IEnumerable<AggregateRequest> aggregations) where TProps : class, new()