Add ActivityPub handler for Delete->Actor activities (#4761)

app/lib/activitypub/activity/delete.rb

@@ -2,6 +2,20 @@
 
 class ActivityPub::Activity::Delete < ActivityPub::Activity
   def perform
+    if @account.uri == object_uri
+      delete_person
+    else
+      delete_note
+    end
+  end
+
+  private
+
+  def delete_person
+    SuspendAccountService.new.call(@account)
+  end
+
+  def delete_note
     status   = Status.find_by(uri: object_uri, account: @account)
     status ||= Status.find_by(uri: @object['_:atomUri'], account: @account) if @object.is_a?(Hash) && @object['_:atomUri'].present?
 
@@ -13,8 +27,6 @@ class ActivityPub::Activity::Delete < ActivityPub::Activity
     delete_now!(status)
   end
 
-  private
-
   def forward_for_reblogs(status)
     return if @json['signature'].blank?