src: ensure that `SetImmediate()`s have `HandleScope`s

Make sure that all native `SetImmediate()` functions have
`HandleScope`s if they create handles.

PR-URL: https://github.com/nodejs/node/pull/19470


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>