Adding median absolute deviation documentation page

[MitchellGale]

Description

Adds documentation for the median_absolute_deviation aggregation function.

Issues Resolved

https://github.com/opensearch-project/documentation-website/issues/4293

Checklist

• [x] By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and subject to the Developers Certificate of Origin. For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[hdhalter]

@martin-gaievski - Can you sign off on this from a technical standpoint? Thanks.

[GumpacG]

This may need more context regarding the compression field. https://github.com/opensearch-project/OpenSearch/blob/ef2a9e5a290262201f069539de45248e1bfe34e4/server/src/main/java/org/opensearch/search/aggregations/metrics/MedianAbsoluteDeviationAggregationBuilder.java#L106

[hdhalter]

@sandeshkr419 - Can you review this for technical accuracy?

[hdhalter]

@sandeshkr419 - Do you approve of this content from a technical standpoint?

@vagimeli for visibility, as you are working on aggregations content.

[sandeshkr419]

@MitchellGale Thanks for drafting up the doc. I have some comments on adding more details to few sections for better understanding.

[vagimeli]

Doc review complete. I'll move this to editorial once suggestions are addressed.

@MitchellGale @sandeshkr419 Please let me know know once the doc review changes are accepted. This will need to go through editorial review before we can merge it. I'll handle that process. We just need an SME's tech review approval before I can move this forward. Thank you.