<Identity Service> Create /users/identityURLs API

[lakshayman]

Create /users/identityURLs route which serves a GET request.

It will return all the identity URL objects by reading all the users object having identityURL.

**IdentityURL object: **

{
    username: ,
    identityURL: ,
    chainCode: ,
}

Refer to the other API in the backend for creating this one especially the members route.

For reference: here

[pallabez]

I'd like to take this task.

[lakshayman]

great!
Assigned it to you

[lakshayman]

Don't need it now