Increases the robustness of CDN resource loading

[izhangxb]

Is your feature request related to a problem? Please describe.
When I'm using monaco-react, I occasionally run into a problem where the CDN resource fails to load, and once it fails, the Editor is unavailable to the user.

Describe the solution you'd like
I want a callback that failed to load and provide a refresh-like action to try to reload the resource.

Or a built-in link with multiple CDNs that can automatically switch alternate links when one is slow to load or fails.

Thanks～

[suren-atoyan]

The default CDN, which is jsdelivr had some issues in China before (if that's the case here).

You can use config method to change the CDN, like here

Also, doesn't loader.init().catchcatch the failed load?