[OAS] Example of Zod usage for API validation

[maryam-saeidi]

Summary

This is an example of how we can use Zod. This PR uses Zod in SLO delete API. (Related to [OAS] zod support)

Here is how you can check the generated OAS for your API:

1. Start ES
2. Add server.oas.enabled: true to kibana.dev.yml
3. Start Kibana yarn start --no-base-path
4. Use one of these options to get the generated OAS for your new API
   • Using pluginId: http://localhost:5601/api/oas?pluginId=@kbn/slo-plugin
   • Using pathStartsWith: http://localhost:5601/api/oas?pathStartsWith=/api/observability/slos

[obltmachine]

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
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