--added lora from peft

--added:
   --load_only_compatible_weights
   --lora_checkpoint_peft
   --train_lora_peft
   --train_lora_loralib
   --lora_checkpoint_peft
   --lora_checkpoint_loralib
--new logic with schedulers
--added linear_scheduler
--get_scheduler()
--get_lora()
--all DDP logic was moved from train_ddp.py to train.py