Delete Lambda prototype

Prototype the User DELETE lambda. Amplify does not include this functionality, so putting it in a Lambda with the fine-grained API. This currently does not invalidate outstanding tokens nor does it clean up the database.
@claytonwwilson You will want to add the clean up code instead of the deleted stuff in UserDeleter

Lambdas/Lists/User/resources/cognitoProperties.json

@@ -0,0 +1,3 @@
+{
+  "userPoolId": "us-east-2_MFgSVKQMd",
+}