Phi-3 (#30423)

* chore(root): Initial commit of Phi-3 files.

* fix(root): Fixes Phi-3 missing on readme.

* fix(root): Ensures files are consistent.

* fix(phi3): Fixes unit tests.

* fix(tests): Fixes style of phi-3 test file.

* chore(tests): Adds integration tests for Phi-3.

* fix(phi3): Removes additional flash-attention usage, .e.g, swiglu and rmsnorm.

* fix(phi3): Fixes incorrect docstrings.

* fix(phi3): Fixes docstring typos.

* fix(phi3): Adds support for Su and Yarn embeddings.

* fix(phi3): Improves according first batch of reviews.

* fix(phi3): Uses up_states instead of y in Phi3MLP.

* fix(phi3): Uses gemma rotary embedding to support torch.compile.

* fix(phi3): Improves how rotary embedding classes are defined.

* fix(phi3): Fixes inv_freq not being re-computed for extended RoPE.

* fix(phi3): Adds last suggestions to modeling file.

* fix(phi3): Splits inv_freq calculation in two lines.

docs/source/en/_toctree.yml

@@ -460,6 +460,8 @@
         title: Persimmon
       - local: model_doc/phi
         title: Phi
+      - local: model_doc/phi3
+        title: Phi-3
       - local: model_doc/phobert
         title: PhoBERT
       - local: model_doc/plbart