src: implement the new EmbedderGraph::AddEdge()

The signature of EmbedderGraph::AddEdge() has been changed so
the current implementation of JSGraph no longer compiles.
This patch updates the implementation accordingly.

PR-URL: https://github.com/nodejs/node/pull/22106
Refs: https://github.com/v8/v8/commit/6ee834532d6f924f6057584085fa79b4777c396a


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>