refactor(endpoints/api/repoemail): added in pre_oci model

### Description of Changes

this is so we can abstract away the data interface

[TESTING->locally with docker compose]

Issue: https://coreosdev.atlassian.net/browse/QUAY-626

## Reviewer Checklist

- [ ] It works!
- [ ] Comments provide sufficient explanations for the next contributor
- [ ] Tests cover changes and corner cases
- [ ] Follows Quay syntax patterns and format

endpoints/api/repoemail_models_interface.py

@@ -0,0 +1,44 @@
+from abc import ABCMeta, abstractmethod
+from collections import namedtuple
+
+from six import add_metaclass
+
+
+class RepositoryAuthorizedEmail(
+  namedtuple('RepositoryAuthorizedEmail', ['email', 'repository_name', 'namespace_name', 'confirmed', 'code',])):
+  """
+  Tag represents a name to an image.
+  :type email: string
+  :type repository_name: string
+  :type namespace_name: string
+  :type confirmed: boolean
+  :type code: string
+  """
+
+  def to_dict(self):
+    return {
+      'email': self.email,
+      'repository': self.repository_name,
+      'namespace': self.namespace_name,
+      'confirmed': self.confirmed,
+      'code': self.code
+    }
+
+
+@add_metaclass(ABCMeta)
+class RepoEmailDataInterface(object):
+  """
+  Interface that represents all data store interactions required by a Repo Email.
+  """
+
+  @abstractmethod
+  def get_email_authorized_for_repo(self, namespace_name, repository_name, email):
+    """
+    Returns a RepositoryAuthorizedEmail if available else None
+    """
+
+  @abstractmethod
+  def create_email_authorization_for_repo(self, namespace_name, repository_name, email):
+    """
+    Returns the newly created repository authorized email.
+    """