Rename Phi-3 rope scaling type
Author: garg-amit
Pull request: yes

# What does this PR do?

The naming around rope scaling type is confusing. Making correction to give the correct name reference and acknowledge the source of the method.
https://arxiv.org/abs/2402.13753

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Comments:
cc @ArthurZucker @gante 

@ArthurZucker in practice, this PR removes `yarn` from phi-3. 

I couldn't find phi-3 models on the hub using `yarn` and, since `longrope` is meant to be an upgrade to `yarn`, I think we can save ourselves some future maintenance with this PR :)

Thanks @gante @ArthurZucker! When can we expect these changes to be merged?

Hey! Just waiting for you to update by doing a deprecation cycle! As the class was kind of public, we want to make sure we don't do a breaking change

@ArthurZucker I've added deprecation warnings to both classes, i.e., `Phi3SuScaledRotaryEmbedding` and `Phi3YarnScaledRotaryEmbedding`.

Hi, eagerly waiting for this to merge. Thank you!

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