Add Correct `dump` Method Support For Classes

[matinraayai]

dump() methods are useful debug utility methods used in the LLVM project to print the contents of an object in gdb in a human-readable form.
We have some classes that implement this method; However, instead of using the LLVM_ENABLE_DUMP macro to force enable it, we must define a new macro e.g. LUTHIER_ENABLE_DUMP instead to decouple force-enabling the dump method from LLVM.