Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/jobs/internal/remove_stale_contacts_job.rb

@@ -0,0 +1,13 @@
+# housekeeping
+# remove contacts that:
+# - have no identification (email, phone_number, and identifier are NULL)
+# - have no conversations
+# - are older than 30 days
+
+class Internal::RemoveStaleContactsJob < ApplicationJob
+  queue_as :housekeeping
+
+  def perform(account, batch_size = 1000)
+    Internal::RemoveStaleContactsService.new(account: account).perform(batch_size)
+  end
+end