[ResourceTree] crash to desktop due to C# resource loader issues

[Seb105]

Issue is not with GodotSharp.SourceGenerators, but is this issue:
godotengine/godot#83762

Use of GD.Load... across the source generator codebase can cause random CTD if resources encounter this issue

[Cat-Lips]

Thanks for addressing this. I think we should probably add some sort of flag and perhaps a central utility method, so when the core problem is resolved we can easily revert/switch/etc. Leave it with me :)

[Seb105]

A central utility method would be good, and I did have the though that it could be extendable somehow so resource tree benefits from a users own cache implementation.

Also async loading of a resource tree is another thing that you could give to the user to override