timers: named anonymous functions

PR-URL: #20397
Refs: #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>

lib/timers.js

@@ -452,7 +452,7 @@ function rearm(timer, start = TimerWrap.now()) {
 }
 
 
-const clearTimeout = exports.clearTimeout = function(timer) {
+const clearTimeout = exports.clearTimeout = function clearTimeout(timer) {
   if (timer && timer._onTimeout) {
     timer._onTimeout = null;
     if (timer instanceof Timeout) {
@@ -464,7 +464,7 @@ const clearTimeout = exports.clearTimeout = function(timer) {
 };
 
 
-exports.setInterval = function(callback, repeat, arg1, arg2, arg3) {
+exports.setInterval = function setInterval(callback, repeat, arg1, arg2, arg3) {
   if (typeof callback !== 'function') {
     throw new ERR_INVALID_CALLBACK();
   }
@@ -773,7 +773,7 @@ setImmediate[internalUtil.promisify.custom] = function(value) {
 exports.setImmediate = setImmediate;
 
 
-exports.clearImmediate = function(immediate) {
+exports.clearImmediate = function clearImmediate(immediate) {
   if (!immediate || immediate._destroyed)
     return;