Remove memory usage token from WindowFunctionAddToSet

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      The window function addToSet uses a std::multimap with an element type of SimpleMemoryUsageTokenWith<Value>. This wrapper is useful for tracking memory in a fairly transparent way using RAII.

      This design seems suboptimal because it means that every element contains a pointer to a memory tracker, and a 64-bit byte count. This memory overhead does not seem worth the tradeoff.

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              Reporter:
              Chris Wolff
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