add hateoas for schema resource

[YANG-DB]

Is your feature request related to a problem?
For the schema resource - add support for hateoas type resources
see https://github.com/opensearch-project/simple-schema/blob/main/docs/endpoint.md#httpsuserdomainsimpleschemadomainschema

What solution would you like?
Schema resource should return in the next format

{
   name: "myDomain",
   user: "someone",
   ontology : "../ontology",
   index : "../index",
   graphql : "../graphql"
}

What alternatives have you considered?
N/A

Do you have any additional context?
see https://restfulapi.net/hateoas/