When the app is a Node.js app, it should also truly support dynamic loading of the required addons/extensions from the graph

[halajohn]

When the app is not a Node.js app, a Node.js addon loader is used to perform on-demand dynamic loading of addons/extensions. However, currently, when the app is a Node.js app (including standalone tests for Node.js addons), all Node.js addons/extensions are loaded upfront. We need to enhance the Node.js addon loader so that it also supports the case when the app itself is a Node.js app, enabling true on-demand dynamic loading of Node.js addons/extensions.