Implement a worker for batch exporting of usage logs

This will allow customers to request their usage logs for a repository or an entire namespace, and we can export the logs in a manner that doesn't absolutely destroy the database, with every step along the way timed.

util/config/schema.py

@@ -16,6 +16,7 @@ INTERNAL_ONLY_PROPERTIES = {
   'SECURITY_SCANNER_ISSUER_NAME',
   'NOTIFICATION_QUEUE_NAME',
   'NAMESPACE_GC_QUEUE_NAME',
+  'EXPORT_ACTION_LOGS_QUEUE_NAME',
 
   'FEATURE_BILLING',
   'BILLING_TYPE',

util/useremails.py

@@ -166,6 +166,16 @@ def send_invoice_email(email, contents):
   mail.send(msg)
 
 
+def send_logs_exported_email(email, export_id, status, exported_data_url=None,
+                             exported_data_expiration=None):
+  send_email(email, 'Export Action Logs Complete', 'logsexported', {
+    'status': status,
+    'export_id': export_id,
+    'exported_data_url': exported_data_url,
+    'exported_data_expiration': exported_data_expiration,
+  })
+
+
 # INTERNAL EMAILS BELOW
 
 def send_subscription_change(change_description, customer_id, customer_email, quay_username):
@@ -182,5 +192,3 @@ def send_subscription_change(change_description, customer_id, customer_email, qu
   msg.html = SUBSCRIPTION_CHANGE.format(change_description, customer_id, customer_email,
                                         quay_username)
   mail.send(msg)
-
-