Refactoring to 1.5.1

[mmarcinmichal]

The code, originally in version 1.4.1, has been upgraded to version 1.5.1. The main changes include:

• Compatibility with Tensorflow 2.13.0
• Compatibility with jax==0.4.20
• Update of dependencies
• Bringing the code to a Build passing status (running tests, with minor exclusions for terraformer and RL tests).

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