Add Mistral.AI's Transformer Model to KerasNLP

[tirthasheshpatel]

Is your feature request related to a problem? Please describe.

Mistral.AI recently released their 7B transformer model with the implementation of the model in PyTorch here: https://github.com/mistralai/mistral-src

Describe the solution you'd like

It would be nice to have the model implemented in Keras Core.

[mattdangerw]

Thanks for taking this on @tirthasheshpatel !

[kanpuriyanawab]

This is great! if @tirthasheshpatel is planning to contribute this model, he could reuse the RoPE layer we already have!