feat: API to add label to contacts (#1563)

app/models/concerns/labelable.rb

@@ -0,0 +1,11 @@
+module Labelable
+  extend ActiveSupport::Concern
+
+  included do
+    acts_as_taggable_on :labels
+  end
+
+  def update_labels(labels = nil)
+    update!(label_list: labels)
+  end
+end