src: fix GetCpuProfiler() deprecation warning

Replace `v8::Isolate::GetCpuProfiler()` with `v8::CpuProfiler::New()`
and cache the instance; creating and disposing an instance every loop
tick is too expensive.

PR-URL: https://github.com/nodejs/node/pull/18534
Fixes: https://github.com/nodejs/node/issues/18039


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>