src: add GetLoadedLibraries routine

Add a static function GetLoadedLibraries under
NativeSymbolDebuggingContext abstraction that provides a list of
shared objects - either the current process depended on or loaded.

PR-URL: https://github.com/nodejs/node/pull/24825


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>