[while_loop] prepare for torch while_loop signature change. #6872
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In pytorch/pytorch#123018, we add support for closures, params and buffers to while_loop in pytorch but it's failing XLA tests here https://hud.pytorch.org/pr/pytorch/pytorch/123018#23324185080 because the signature of the implantation of DispatchKey.xla needs to be modified. This pr prepares xla key implementation to accept additional_inputs.
Right now, it's just a None value. We need to add proper support for
additional_inputsin _xla_while_loop and probably add more tests for closures, parameters and buffers when pytorch/pytorch#123018 ships.