ReadHandler for repository should make repository endpoint url available.

[sankalpbhandari]

Is your feature request related to a problem? Please describe.
Without it, GetAtt cannot get endpoint url for repositories

Describe the solution you'd like
Translator should populate Repository endpoint URL into the resource model using getRepositoryEndpointUrl APIs

[detam-amazon]

Reviewed with jonjara and sankalpbhandari.
Sankalp to add more details on potential use cases for this.
Assigning to backlog for now to track demand for this.