Method GetTreeAggregateSqlPreviewAsync<TProps>(TreeQueryContext<TProps>, IEnumerable<AggregateRequest>)
SQL Preview for Tree Aggregate (DRY - same SQL as Execute)
public Task<string> GetTreeAggregateSqlPreviewAsync<TProps>(TreeQueryContext<TProps> context, IEnumerable<AggregateRequest> aggregations) where TProps : class, new()