Add `XLNetTokenizer` #3886

Job	Run time
Test the code with tf.keras	27m 22s
Check the code format	1m 28s
Test the code with Keras Core (tensorflow)	25m 28s
Test the code with Keras Core (jax)	20m 43s
Test the code with Keras Core (torch)	20m 56s
	1h 35m 57s

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