Remove support for hashing of Quantity objects

Closes #532

Signed-off-by: Sahas Subramanian <[email protected]>

Author: shsms

src/frequenz/sdk/timeseries/_quantities.py

@@ -100,14 +100,6 @@ def isinf(self) -> bool:
         """
         return math.isinf(self._base_value)
 
-    def __hash__(self) -> int:
-        """Return a hash of this object.
-
-        Returns:
-            A hash of this object.
-        """
-        return hash((type(self), self._base_value))
-
     def __repr__(self) -> str:
         """Return a representation of this quantity.