Feature Add Monotonic function definitions #14151
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Which issue does this PR close?
Closes #.
Rationale for this change
This PR creates a definition of set-monotonicity for Aggregate expressions. Some aggregation functions create ordered results by definition (such as count, min, max). With this PR, we're adding this information to the output ordering and be able to remove some SortExecs while optimizing
What changes are included in this PR?
Are these changes tested?
Are there any user-facing changes?