fix: Fix adding missing columns for ORDER BY clause
#185
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This PR fixes an issue with
ORDER BYclause adding missing columns in an incorrect way. Issues fixed:LogicalPlanBuilder::sortcould add duplicate columns.LogicalPlanBuilder::add_missing_columnsdid not recognize that the inputs could already have unqualified aliasrewrite_sort_col_by_aggsunnormalized columns before normalizing them back; this would yield incorrect qualifierextract_aliased_expr_namesdid not extract column names for aliased projections