[REQUEST]: Recipes for fetching more than 10k agents with `/api/fleet/agents`

[jen-huang]

Description

With elastic/kibana#213486, GET /api/fleet/agents now supports fetching beyond the first 10k agents using searchAfter and PIT (point-in-time) parameters.

We should provide examples for users, perhaps on the existing Kibana Fleet APIs
page.

The PR has some curl examples. I can help to translate these to Dev Tools console requests if needed. I found that the console has some odd behavior around comma (,) characters which means they need to be encoded to %2C which is not the most user friendly, which is why I used curl examples in the PR.

Resources

elastic/kibana#213486
https://www.elastic.co/guide/en/fleet/current/fleet-api-docs.html

Collaboration

Other (please describe below in the Point of contact section).

Point of contact.

Main contact: @jen-huang can help docs team to produce initial content from the referenced PR

Stakeholders: Fleet team