…192806)

This PR introduces the following API routes for listing Entity Store
"entities":

<meta charset="utf-8"><b style="font-weight:normal;"
id="docs-internal-guid-9410c5d7-7fff-e873-6830-887939a306fb"><div
dir="ltr" style="margin-left:-0.75pt;" align="left">
List Entities | GET /api/entity_store/entities/list
-- | --
</div></b>

The PR includes the following:
 - The OpenAPI schemas for the route
 - The actual Kibana side endpoint
 - Add searchEntities function to the `EntityStoreDataClient`
 

### How to test

1. Add some host/user data
* Easiest is to use
[elastic/security-data-generator](https://github.com/elastic/security-documents-generator)
2. Make sure to add `entityStoreEnabled` under
`xpack.securitySolution.enableExperimental` in your `kibana.dev.yml`
3. In kibana dev tools or your terminal, call the `INIT` route for
either `user` or `host`.
4. You should now see 2 transforms in kibana. Make sure to re-trigger
them if needed so they process the documents.
5. Call the new API, and it should return entities 



Implements elastic/security-team#10517

### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

…92806) (#193562)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[SecuritySolutions] Create Entity Store 'entities/list' API
(#192806)](#192806)

<!--- Backport version: 8.9.8 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Create Entity Store 'entities/list' API (#192806)\n\nThis PR introduces
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style=\"font-weight:normal;\"\r\nid=\"docs-internal-guid-9410c5d7-7fff-e873-6830-887939a306fb\"><div\r\ndir=\"ltr\"
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process the documents.\r\n5. Call the new API, and it should return
entities \r\n\r\n\r\n\r\nImplements
https://github.com/elastic/security-team/issues/10517\r\n\r\n###
Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common
scenarios\r\n\r\n---------\r\n\r\nCo-authored-by: kibanamachine
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BACKPORT-->

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>