Upgrade Deno to 1.30.3

[DavidDeSimone]

After a long break, I want to revisit emacs-ng js side. Over time, it appears that the JS feature set has fallen into decay. I see that @declantsien appears to have commented it out for now.

I would like to take that as an opportunity to clean up the JS side of things using some lessons learned from https://github.com/DavidDeSimone/ng-js.

Instead of the tightly coupled JS engine, the JS engine will run on a separate thread. Deno and emacs-ng will communicate via message passing. This may slightly break compatibility with older JS packages - however I generally think I can keep general compatibility.