Add `FalconTokenizer` (#1485) #1

Job	Run time
Check the code format	2m 35s
Test the code with Keras 2	18m 55s
Test the code with Keras 3 (tensorflow)	19m 46s
Test the code with Keras 3 (jax)	13m 59s
Test the code with Keras 3 (torch)	10m 15s
	1h 5m 30s

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