Add a converter from mamba_ssm -> huggingface mamba (#29705)
* implement convert_mamba_ssm_checkpoint_to_pytorch
* Add test test_model_from_mamba_ssm_conversion
* moved convert_ssm_config_to_hf_config to inside mamba_ssm_available check
* fix skipif clause
* moved skips to inside test since skipif decorator isn't working for some reason
* Added validation
* removed test
* fixup
* only compare logits
* remove weight rename
* Update src/transformers/models/mamba/convert_mamba_ssm_checkpoint_to_pytorch.py
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>
* nits
---------
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>