[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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[marciw]

One sentence jumped out at me so just commenting on that one for now.

I like the collapsible sections 👍

[pquentin]

Thanks, this looks good to me.

I'm happy to merge this as is, but given the amout of content is significant, what are your thoughts on using a specific page for this, as was done for OpenTelemetry?

[szabosteve]

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

[marciw]

Suggestion you can take or leave as you see fit! :)

[pquentin]

Thanks! Again, this looks good to me and can be merged, but is it useful to add a link from integrations to the new page, as is done for OpenTelemetry?

[pquentin]

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