Hidden via a symbol because I'm unsure exactly what the API should look
like in the end.
Removes the need to use _unrefActive for efficiently refreshing
timeouts.
It still uses it under the hood but that could be replaced with
insert() directly if it were in the same file.
PR-URL: https://github.com/nodejs/node/pull/18065
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Jeremiah Senkpiel
bb5575aa75