dbrx
Author: eitanturok
Pull request: yes

# What does this PR do?

Add dbrx to `transformers` from https://github.com/databricks/dbrx/tree/main/model.

To run dbrx:
```python
from transformers import DbrxForCausalLM
model = DbrxForCausalLM.from_pretrained(
    "databricks/dbrx-instruct",
    device_map="auto",
    )
```

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Fixes # (issue)


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Comments:
GH Issue here: https://github.com/huggingface/transformers/issues/29911

you need to add dbrx to the `tokenization_auto.py` and `configuration_auto.py`

Closing this PR because it is being complete here #29921