Add Solar-Open Model
Author: oesni
Pull request: yes
Labels: name: New model

# What does this PR do?

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Implements Solar-Open model. 
Solar Open is the open-weights MoE Solar LLM created by Upstage.
- model repo: https://huggingface.co/upstage/Solar-Open-100B
- technical report: https://huggingface.co/papers/2601.07022


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Comments:
@oesni you can ping me when you think it's ready for review (assuming it's not yet because it's a draft)

It's ready for review! @vasqu 
But after rebase, it seems some tests fails. 
I'll work on it.

wonder if it's okay to add `SolarOpenConfig` class to `OBJECTS_TO_IGNORE` in `utils/check_docstrings.py` since auto-generated config class fails docstring check.
There is comment for `OBJECTS_TO_IGNORE`: `Do not add anything here ...`

> wonder if it's okay to add SolarOpenConfig class to OBJECTS_TO_IGNORE in utils/check_docstrings.py since auto-generated config class fails docstring check.
There is comment for OBJECTS_TO_IGNORE: Do not add anything here ...

Just checked why it failed, we should not add it there. You can run `make fix-repo` and you will see that it complains because the config has a wrong default for `rope_parameters` but since we will change it (we should default to None --> non-mutable args) either way let's wait. We can take a look afterwards or I just quickly fix that no worries

run-slow: solar_open

This comment contains `run-slow`, running the specified jobs: 

models: ["models/solar_open"]
quantizations: []

## CI Results
[Workflow Run ⚙️](https://github.com/huggingface/transformers/actions/runs/21042933649)

✅ No failing test specific to this PR 🎉 !


All comments have been addressed, and I confirmed that the failing tests are related to a different models. 🤗 
(`Idefics2ProcessorTest` and `GlmImageModelTest`)
@vasqu 

Yup, dont worry about the CI - it's been a bit flaky these past few days/weeks

run-slow: solar_open

This comment contains `run-slow`, running the specified jobs: 

models: ["models/solar_open"]
quantizations: []

## CI Results
[Workflow Run ⚙️](https://github.com/huggingface/transformers/actions/runs/21216059574)

✅ No failing test specific to this PR 🎉 !


**[For maintainers]** Suggested jobs to run (before merge)

run-slow: auto, solar_open

run-slow: solar_open

This comment contains `run-slow`, running the specified jobs: 

models: ["models/solar_open"]
quantizations: []

## CI Results
[Workflow Run ⚙️](https://github.com/huggingface/transformers/actions/runs/21217257651)

✅ No failing test specific to this PR 🎉 !


Merging now :hugs: thanks for the contribution

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_43244). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

Thanks for the review! 🤗  @vasqu