Method GetSqlPreviewAsync<TProps>(TreeQueryContext<TProps>)
Pro: Tree SQL Preview (DRY - uses BuildTreeQuerySqlAsync)
Override of base Open Source method - returns CTE + PVT SQL
Supports WhereHasAncestor/WhereHasDescendant preview
public override Task<string> GetSqlPreviewAsync<TProps>(TreeQueryContext<TProps> context) where TProps : class, new()