Convert Correlation to UDAF #10884
Description
Is your feature request related to a problem or challenge?
Similar to other issues in #8708 Move datafusion/physical-expr/src/aggregate/correlation.rs to datafusion/functions-aggregate/src/correlation.rs
I found CovarianceAccumulator in datafusion/physical-expr/src/aggregate/covariance.rs is not removed, we should remove it and use the one in datafusion/functions-aggregate/src/covariance.rs instead. The same with StddevAccumulator
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Additional context
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