feat(workflows): add "attribute action" action

This action lets users perform several actions on threads, such as
(un)lock, (un)set as trending, (un)pin, set as non-issue, obsolete, etc.

The action selector shows the action with the codename it has in the
Protobuf enum. We will show a friendly string when we localize the
feature.

Bug: twpowertools:74

Change-Id: I95f9f1904ffe559c92a786cbdb327613c8ca32ca
diff --git a/src/workflows/proto/main_pb.js b/src/workflows/proto/main_pb.js
index 961a61c..75ee13b 100644
--- a/src/workflows/proto/main_pb.js
+++ b/src/workflows/proto/main_pb.js
@@ -2195,7 +2195,12 @@
   AA_SET_TRENDING: 8,
   AA_UNSET_TRENDING: 9,
   AA_SET_ISSUE_RESOLVED: 10,
-  AA_UNSET_ISSUE_RESOLVED: 11
+  AA_UNSET_ISSUE_RESOLVED: 11,
+  AA_SOFT_LOCK: 12,
+  AA_UNSOFT_LOCK: 13,
+  AA_EXCLUDE_FROM_GOLDEN: 14,
+  AA_UNEXCLUDE_FROM_GOLDEN: 15,
+  AA_INCLUDE_IN_GOLDEN: 16
 };
 
 /**