[chore] Change array list attribute to integer attribute

[erick-xanadu]

custom_calls will have the following syntax:

%0 = catalyst.custom_call fn("lapack_dgesdd") (%arg0, %arg1) {number_original_arg = array<i32: 1>} : (memref<3x3xf64>, memref<3x3xf64>) -> memref<3x3xf64>

This number_original_arg has no reason to be an integer array. It can be just an integer.

(env) ubuntu@touched-stingray:~/code/catalyst$ git grep getNumberOriginal
mlir/lib/Catalyst/Transforms/catalyst_to_llvm.cpp:        int32_t numberArg = op.getNumberOriginalArgAttr()[0];