[DOCS] Add top-level EQL docs page. Adds EQL requirements page. #51334
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Changes
Creates a top-level page for EQL in the ES reference.
This page contains a high-level introduction and will include a nav for other EQL docs pages as they're built.
Creates a requirements page.
This page outlines the fields needed to use EQL in ES.
Note to reviewers
This PR isn't intended to encompass all needed EQL docs. I'll be working incrementally to add new pages. However, the overview page is a required first step for adding those new pages.