[DOCS] Adds ES|QL and Pandas section to the Integrations section

[szabosteve]

Overview

This PR adds an ES|QL and Pandas section to the Integrations page. The content is based on this blog published on Search Labs. The examples remain the same, the style of the explanatory text is adjusted slightly to be in line with the documentation style (less conversational).

I also added the index mapping request and the bulk ingest request behind closed collapsible sections, so users don't need to leave the page. @pquentin @marciw if you think it's better to exclude the requests, let me know. We can also add the content as a subpage of the Integrations page if we think it's better.

Preview

Integrations

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[szabosteve]

@pquentin I agree. I moved the content to a subpage under Integrations in my latest commits.

[pquentin]

Thanks for iterating @szabosteve and for the previous help @marciw! This is great.