[Misc] Merge bitsandbytes_stacked_params_mapping and packed_modules_mapping

[jeejeelee]

They can be converted between each other. We can remove bitsandbytes_stacked_params_mapping and convert packed_modules_mapping to achieve the functionality of bitsandbytes_stacked_params_mapping, thereby further cleaning up the model's static variables

TODO

• delete bitsandbytes_stacked_params_mapping from all models

[github-actions]

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