perf(eda.correlation): performance tuning

Introduces DataArray and avoids redundant data readings
for plot_correlation(df, *)

Author: jinglinpeng

.pylintrc

@@ -143,7 +143,8 @@ disable=print-statement,
         ungrouped-imports,
         too-few-public-methods,
         redefined-outer-name,
-        no-else-return
+        no-else-return,
+        unsubscriptable-object
 
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