[feat] add `load_lora_adapter()` for compatible models (#9712)
* add first draft.
* fix
* updates.
* updates.
* updates
* updates
* updates.
* fix-copies
* lora constants.
* add tests
* Apply suggestions from code review
Co-authored-by: Benjamin Bossan <BenjaminBossan@users.noreply.github.com>
* docstrings.
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Co-authored-by: Benjamin Bossan <BenjaminBossan@users.noreply.github.com>