Localize notification_utils to the admin

This changeset pulls in all of the notification_utils code directly into the admin and removes it as an external dependency. We are doing this to cut down on operational maintenance of the project and will begin removing parts of it no longer needed for the admin.

Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>

app/models/__init__.py

@@ -1,6 +1,7 @@
 from abc import abstractmethod
 
 from flask import abort
+
 from notifications_utils.serialised_model import (
     SerialisedModel,
     SerialisedModelCollection,

app/models/event.py

@@ -1,10 +1,9 @@
 from abc import ABC, abstractmethod
 
-from notifications_utils.formatters import formatted_list
-
 from app.formatters import format_thousands
 from app.models import ModelList
 from app.notify_client.service_api_client import service_api_client
+from notifications_utils.formatters import formatted_list
 
 
 class Event(ABC):

app/models/service.py

@@ -1,5 +1,4 @@
 from flask import abort, current_app
-from notifications_utils.serialised_model import SerialisedModelCollection
 from werkzeug.utils import cached_property
 
 from app.models import JSONModel, SortByNameMixin
@@ -15,6 +14,7 @@ from app.notify_client.organizations_api_client import organizations_client
 from app.notify_client.service_api_client import service_api_client
 from app.notify_client.template_folder_api_client import template_folder_api_client
 from app.utils import get_default_sms_sender
+from notifications_utils.serialised_model import SerialisedModelCollection
 
 
 class Service(JSONModel, SortByNameMixin):