Add OLMo November 2024

[2015aroras]

What does this PR do?

An updated OLMo model will be released in November. The new model has a few small architecture changes compared to the existing model in transformers:

• RMSNorm is used instead of standard layer norm.
• Norm is applied to attention queries and keys.
• Norm is applied after attention/feedforward rather than before.

The original PR #34497 updated the OLMo implementation in transformers to support the November release. This PR instead adds a new model using the modular approach.

@ArthurZucker

Fixes #34496

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[2015aroras]

I tested this before we locked in the Olmo1124 naming conventions. Will update once tested.

[2015aroras]

Tests are passing, including slow ones (except for Olmo1124ModelTest::test_generate_compile_1_end_to_end, but this appears to be broken for base OLMo too so I'm considering it an existing problem).. I've used a test HF hub repo (shanearora/OLMo-7B-1124-hf) since the official final model is not ready yet.

[2015aroras]

PR checks were passing before I merged main again, and PR check failures relate to other models.