Allow modules to handle uncaught errors/unhandled rejections

[bajtos]

Implement globalThis.addEventListener("unhandledrejection", (event) => {}), see https://developer.mozilla.org/en-US/docs/Web/API/Window/unhandledrejection_event

This will allow Voyager to graciously handle global errors escaping from the Saturn client and prevent the module from frequently crashing.

Related:

• https://deno.com/blog/v1.24#unhandledrejection-event

Consider reverting the following changes after we update Voyager to not crash on uncaught errors from Saturn:

• change Voyager crashes into info core#401
• fix don't report expected voyager crashes to sentry core#421