[DOC] Add documentation for new Parameter verbose_pipeline

[junweid62]

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RFC opensearch-project/OpenSearch#16705
In this approach, the verbose_pipeline parameter is introduced as a query parameter in the search request URL. When used in conjunction with the search_pipeline parameter, it activates a debugging mode, allowing detailed tracking of search pipeline processor execution without requiring a new API.

Version: 2.19 and after

What other resources are available? RFC opensearch-project/OpenSearch#16705