[ML] Adding DNS look up logic for triaging EIS timeouts

[jonathan-buttner]

This PR is stacked on: #123639, that one needs to be merged first.

This PR adds logic to look up the IP of the EIS getaway and log it.

To enable it debug needs to be enabled for the ElasticInferenceServiceAuthorizationRequestHandler class and a setting needs to be enabled.

Enabling via dev tools:

PUT _cluster/settings
{
  "transient": {
"logger.org.elasticsearch.xpack.inference.services.elastic.authorization.ElasticInferenceServiceAuthorizationRequestHandler": "DEBUG",
"xpack.inference.elastic.authorization_debugging_dns_lookup_enabled": true
  }
}

Enabling via gradle

./gradlew :run -Drun.license_type=trial -Dtests.es.xpack.inference.elastic.url=https://localhost:8443 -Dtests.es.xpack.inference.elastic.http.ssl.verification_mode=none -Dtests.es.logger.org.elasticsearch.xpack.inference.services.elastic.authorization.ElasticInferenceServiceAuthorizationRequestHandler=DEBUG -Dtests.es.xpack.inference.elastic.authorization_debugging_dns_lookup_enabled=true

The output will look like this:

[2025-02-28T16:42:38,377][DEBUG][o.e.x.i.s.e.a.ElasticInferenceServiceAuthorizationRequestHandler] [runTask-0] Attempting to look up authorization gateway host info
[2025-02-28T16:42:38,377][DEBUG][o.e.x.i.s.e.a.ElasticInferenceServiceAuthorizationRequestHandler] [runTask-0] Looking up authorization gateway ip for url: https://localhost:8443, host: localhost
[2025-02-28T16:42:38,377][DEBUG][o.e.x.i.s.e.a.ElasticInferenceServiceAuthorizationRequestHandler] [runTask-0] Gateway address: 127.0.0.1