Added self-destructing/expiring statuses

• Added:
- self-destructing/expiring statuses for GabPRO members only
- ExpiringStatusWorker
- stopwatch icon
- expires_at redux values
- expires_at button in composer
- expires at selection popover

• Updated:
- Schedule status button to not show if expiring status active

app/workers/expiring_status_worker.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class ExpiringStatusWorker
+  include Sidekiq::Worker
+
+  sidekiq_options unique: :until_executed
+
+  def perform(status_id)
+    status = Status.find(status_id)
+    RemovalWorker.perform_async(status.id)
+  rescue ActiveRecord::RecordNotFound
+    true
+  end
+end