Add `version()` API to unify with Keras and KerasNLP #8811

Job	Run time
Test the code with Keras 2	9m 10s
Check the code format	1m 35s
Test the code with Keras 3 (tensorflow)	7m 3s
Test the code with Keras 3 (jax)	7m 34s
Test the code with Keras 3 (torch)	4m 22s
	29m 44s

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