add support for "Spamming" reason

This PR adds the 'Spamming' reason to our code. It helps the system detect and zap spammy posts. Made updates to the code to handle this new reason.

visibilitylib/src/main/scala/com/twitter/visibility/rules/Action.scala

@@ -130,6 +130,7 @@ object Reason {
   case object LocalLawsWithheld extends Reason
   case object HatefulConduct extends Reason
   case object AbusiveBehavior extends Reason
+  case object Spamming extends Reason // Add a new case object for "Spamming"
 
   case object NotSupportedOnDevice extends Reason
 
@@ -190,6 +191,7 @@ object Reason {
     reason match {
       case HatefulConduct => Some(AppealableReason.HatefulConduct(violationLevel.level))
       case AbusiveBehavior => Some(AppealableReason.AbusiveBehavior(violationLevel.level))
+      case Spamming => Some(AppealableReason.Spamming(violationLevel.level)) // New case for handling Spamming
       case _ => Some(AppealableReason.Unspecified(violationLevel.level))
     }