Tests

Add `version()` API to unify with Keras and KerasNLP #8468

Job	Run time
Check the code format	1m 39s
Test the code with Keras 3 (tensorflow)	5m 0s
Test the code with Keras 2	7m 48s
Test the code with Keras 3 (jax)	6m 35s
Test the code with Keras 3 (torch)	3m 32s
	24m 34s

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