Add `XLNetTokenizer` #3883

Job	Run time
Test the code with tf.keras	26m 17s
Test the code with Keras Core (tensorflow)	31m 22s
Test the code with Keras Core (jax)	25m 53s
Test the code with Keras Core (torch)	16m 9s
Check the code format	1m 40s
	1h 41m 21s

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