Add Llama 3.1, 3.2, 3.3 to KerasHub

[divyashreepathihalli]

assigned to Rahul Kumar

[pkgoogle]

Is this open? If it is I'll work on it.

[abheesht17]

Rahul's working on 3.1. Can pick the rest!

[pkgoogle]

Ok I'll work on 3.2 for now.

[pctablet505]

I've created Llama3.1 model class and raised a pull request. Numeric verifications are done, for defined and random inputs both.

#2132

Still there is more work required as tokenizer test is not passing, nor the model test is passing.

[vedantag17]

Is anyone working on 3.3? I would like to work on it!

[cheachu]

Hey @vedantag17 , I just started working on it :)