Directly get object instance ID from Variant and implement Variant::get_validated_object() #1591 
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This will fix issue #1587 after Godot PR godotengine/godot#97119 is merged (which probably means Godot 4.4+)
It allows us to safely call
Variant::operator ObjectID()even on objects that have been freed, and implementsVariant::get_validated_object()which exists in Godot itself, and is a very convenient way to check if an object is valid.Marking as a draft until PR godotengine/godot#97119 is merged