Fix graal.js dependencies to work with other mods, and not break on graalvm

[wagyourtail]

this is very cursed code... could probably be done a little better with a IDependencyLocator that actually just checks if graalvm and then conditionally loads the deps. but this is 100x easier to write.

why doesn't neo just have a way to do this in jarjar.

(maybe don't merge yet...)
also, I haven't fully tested it, just the testscript command

[CLAassistant]

All committers have signed the CLA.

[wagyourtail]

hopefully neoforged/JarJar#5 will result in a better solution

[rubensworks]

Thanks @wagyourtail!
I'll try to have a detailed look at this in the near future.

[rubensworks]

Thanks for going through this effort @wagyourtail!

The code is however a bit too cursed for my taste 😅

I did however see that Graal has made changes that may fix the shadow issues. So I'll await the next Graal release, and try to make it work that way.