timers: named anonymous functions

PR-URL: https://github.com/nodejs/node/pull/20397
Refs: https://github.com/nodejs/node/issues/8913


Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>