feat: Updates for intrinsics support

[frreiss]

This PR includes changes from @jakelorocco that implement intrinsics support, plus additional changes that I have made to enable the RAG intrinsics to work.

Jacob's changes:

• Major rewrite of the guts of three different backends
• GraniteCommonAdapter class and supporting classes
• Replace code that calls aLoRA adapters directly with code that uses equivalent intrinsics
• Some test cases
• Documentation

My additional changes:

• Modify intrinsics loading to support switching between Hugging Face Hub repositories (AKA "models")
• Add Python functions to serve as entry points for existing RAG intrinsics
• Add test cases of existing RAG intrinsics

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[jakelorocco]

looks mostly good to me! I left a few comments and we should definitely let others review as well (I will bring this up in our team meeting Wednesday).

Also, it looks like the pre-commit checks are failing. I think it's an issue from my base branch, but could you please run pre-commit run --files mellea/backends/openai.py. Or you can just move from enum import Enum below from copy import deepcopy in that file.

Once that gets fixed, we can make sure the github runners can run the new tests (else we'll have to mark them as qualitative). Thank you!

[frreiss]

FYI @pronics2004

[jakelorocco]

After the discussion on other comments, I also realize a difference here. Because we are no longer creating the adapter config in the backend, the base_model_name must be known here (when the Backend could be any type of backend).

Let me investigate a solution, but backend.model_id can be of types str | ModelIdentifier. At the very least, we should handle some basic version of the ModelIdentifier case. I was splitting on the .hf_model_name but that might not be the best assumption at this point.

[jakelorocco]

@frreiss, I also have a few changes related to my previous comments. How would you like to handle those? I can fork your fork and open up a PR, you can give me access to your repo, or I can send you the git diff.

[jakelorocco]

@frreiss, I also have a few changes related to my previous comments. How would you like to handle those? I can fork your fork and open up a PR, you can give me access to your repo, or I can send you the git diff.

@frreiss, I opened up this fork and pull request with my changes: frreiss#3. Please let me know if you see any issues / would prefer I merge these changes differently. Otherwise, please merge if you are okay with them.

[frreiss]

This PR should be ready to merge now, but the CI workflow keeps canceling itself after 7 minutes.