refactor of model targets and constraints, addition of new constraint types and constraint construction process

app/models/constraints/generic_constraint.py

@@ -0,0 +1,17 @@
+import logging
+
+from pulp import lpSum
+from pydantic import BaseModel
+from typing import TypeVar, Type
+
+from helpers.common_helper import *
+
+from models.attribute import Attribute
+from models.problem import Problem
+
+_T = TypeVar("_T")
+
+class GenericConstraint(BaseModel):
+    reference_attribute: Attribute
+    minimum: float
+    maximum: float