Remove unused LockFile and FilePermissions classes which are remnants from caching

Signed-off-by: Adam Glustein <Adam.Glustein@Point72.com>

Author: AdamGlustein

csp/impl/struct.py

@@ -105,18 +105,12 @@ def collectts(cls, **kwargs):
 
         return csp.struct_collectts(cls, kwargs)
 
-    @classmethod
-    def _postprocess_dict_to_python(cls, d):
-        return d
-
     @classmethod
     def _obj_to_python(cls, obj):
         if isinstance(obj, Struct):
-            return obj._postprocess_dict_to_python(
-                {k: cls._obj_to_python(getattr(obj, k)) for k in obj.__full_metadata_typed__ if hasattr(obj, k)}
-            )
+            return {k: cls._obj_to_python(getattr(obj, k)) for k in obj.__full_metadata_typed__ if hasattr(obj, k)}
         elif isinstance(obj, dict):
-            return {k: cls._obj_to_python(v) for k, v in obj.items()}
+            return type(obj)({k: cls._obj_to_python(v) for k, v in obj.items()})  # type() for derived dict types
         elif (
             isinstance(obj, (list, tuple, set)) or type(obj).__name__ == "FastList"
         ):  # hack for FastList that is not a list