Add PackedArrayRef classes, instances of PackedArrayRefRAII. #98373
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Closes godotengine/godot-proposals#10830.
The use-case of these new objects are explained in the proposal, but in short: They allow strongly typed in-place modification of Packed arrays. In-place modification without this PR is only possible through Variant's stringy interfaces.
This PR compiles, but I have not yet tested the behavior. In particular:
PackedArrayRefRAII
classes should be especially useful in GDExtensions, and thus should be exposed to them. I have not not done this before yet so I'll have to take another look at that.