Disable PEFT input autocast when using fp8 layerwise casting (#10685)
* disable peft input autocast
* use new peft method name; only disable peft input autocast if submodule layerwise casting active
* add test; reference PeftInputAutocastDisableHook in peft docs
* add load_lora_weights test
* casted -> cast
* Update tests/lora/utils.py