perf(fts): Eliminate SortExec from FTS queries#1
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MatchQueryExec now declares _score DESC in its PlanProperties, and TakeExec propagates input ordering through the schema change instead of discarding it. Together these let DataFusion's optimizer eliminate the downstream SortExec for FTS queries — removing a full-sort over all BM25 candidates that was pure overhead, particularly costly on queries without a LIMIT