Add contribution analysis function

[ylwu-amzn]

Contribution analysis is to find the top contributors to some abnormal period like which server contributes most for the error spike.
We can integrate anomaly localization with ml-commons to provide general anomaly localization function.

[elfisher]

@ylwu-amzn is this still targeting 2.1? If so, can we add a label for 2.1?

[ylwu-amzn]

@elfisher thanks for tracking this. Actually we have released it in 2.0. https://opensearch.org/docs/latest/ml-commons-plugin/algorithms/#anomaly-localization

[elfisher]

Updated. Thanks!