src: expose TraceEventHelper with NODE_EXTERN

As node requires a tracing controller to be initialized embedders need
access to the TraceEventHelper so that we can actually set the tracing
controller.

Refs: https://github.com/electron/electron/commit/0e5b6f93000e4718c9e35332ddbd0f6b76cdd585/#diff-89b287b2edd0a02dddae60cb26157f47

PR-URL: https://github.com/nodejs/node/pull/28724


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>