perf_hooks: move perf_hooks out of experimental

PR-URL: #31101
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

doc/api/perf_hooks.md

@@ -2,7 +2,7 @@
 
 <!--introduced_in=v8.5.0-->
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 The Performance Timing API provides an implementation of the
 [W3C Performance Timeline][] specification. The purpose of the API