OpenELM Architecture Adapter

[jlarson4]

Added an Architecture Adapter for Apple's OpenELM collection of models.
Added handling for the following additional cases that are new for OpenELM:

• prepare_model and prepare_loading in ArchitectureAdapters – These hooks allow us to patch compatibility issues between the OpenELM remote code and transformers v5.

• trust_remote_code – OpenELM's modeling code comes from HuggingFace, and not transformers v5. In order to get that information from HuggingFace, we need to set trust_remote_code to true for all HF calls

• repetition_penalty – Apple's OpenELM example generations suggest using this HuggingFace parameter for generation, so we have recreated it for TransformerLens to ensure we can match the generation done in hugging face effectively

• New feature (non-breaking change which adds functionality)

Checklist:

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have not rewritten tests relating to key interfaces which would affect backward compatibility