ADD evaluation

[utkarshp1161]

1. Nequip
2. Allegro
3. Mace
4. Botnet
5. Equiformer
6. TorchMDnet - done

[Vaibhav525]

Added MACE and BOTNet evaluation script eval_mae.py

Example command:
python /home/civil/btech/ce1180169/MDBENCHGNN/mdbenchgnn/models/mace/scripts/eval_mae.py --configs="/home/civil/btech/ce1180169/MDBENCHGNN/example_mdbenchgnn/md17/aspirin/test/botnet.xyz" --model="/home/civil/btech/ce1180169/Output_mdbgnn/mace/md17/aspirin/MACE_model_500_aspirin.model" --output="output_dir_sl/mace/md17/aspirin/eval.txt" --device cuda --default_dtype float32

1. Nequip
2. Allegro
3. Mace - done
4. Botnet - done
5. Equiformer
   6.TorchMDnet - done