[FEATURE] Add Trust Endpoint for Rekognition

[mingshl]

Is your feature request related to a problem?
Inspired by this comment, should add Trust Endpoint for Amazon Rekognition
Do you have any additional context?
Add any other context or screenshots about the feature request here.

[pyek-bot]

curious to know what a "trust endpoint" is?

[dhrubo-os]

curious to know what a "trust endpoint" is?

use case: https://opensearch.org/docs/latest/ml-commons-plugin/remote-models/index/#adding-trusted-endpoints

More details: https://opensearch.org/docs/latest/ml-commons-plugin/cluster-settings/#add-trusted-url

[brianf-aws]

Lets implement here

ml-commons/plugin/src/main/java/org/opensearch/ml/settings/MLCommonsSettings.java

Line 160 in 80de6e3

.listSetting(