FIX Issues with AdaLora initialization (#1652)
Resolves #1647
- AdaLoraConfig now converts target_modules to set, same as LoRA
- AdaLoraConfig now raises when used with DoRA
- AdaLoraConfig now raises when used with LoftQ
- AdaLoraModel now raises when trying to call add_weighted_adapter
- Add tests for those in test_initialization.py
- Small clean ups in test_initialization.py
