feat: reads potentions from ljc file

diceplayer/environment/atom.py

@@ -1,9 +1,9 @@
 from diceplayer.utils.ptable import AtomInfo, PTable
 
-from dataclasses import dataclass
+from pydantic.dataclasses import dataclass
 
 
-@dataclass
+@dataclass(slots=True)
 class Atom:
     """
     Atom class declaration. This class is used throughout the DicePlayer program to represent atoms.