fix: Move setter and deleter to Attribute class instead of `Fun…

…ction`, since that's how properties are instantiated

Issue-311: #311

src/_griffe/agents/visitor.py

@@ -423,7 +423,7 @@ def handle_function(self, node: ast.AsyncFunctionDef | ast.FunctionDef, labels:
         if overload:
             self.current.overloads[function.name].append(function)
         elif property_function:
-            base_property: Function = self.current.members[node.name]  # type: ignore[assignment]
+            base_property: Attribute = self.current.members[node.name]  # type: ignore[assignment]
             if property_function == "setter":
                 base_property.setter = function
                 base_property.labels.add("writable")

src/_griffe/models.py

@@ -1741,12 +1741,13 @@ def __init__(
         """The function return type annotation."""
         self.decorators: list[Decorator] = decorators or []
         """The function decorators."""
-        self.setter: Function | None = None
-        """The setter linked to this function (property)."""
-        self.deleter: Function | None = None
-        """The deleter linked to this function (property)."""
         self.overloads: list[Function] | None = None
         """The overloaded signatures of this function."""
+        # YORE: Bump 1: Remove block.
+        self.setter: Function | None = None
+        """Deprecated. See [Attribute.setter][griffe.Attribute.setter]."""
+        self.deleter: Function | None = None
+        """Deprecated. See [Attribute.deleter][griffe.Attribute.deleter]."""
 
         for parameter in self.parameters:
             parameter.function = self
@@ -1797,6 +1798,10 @@ def __init__(
         """The attribute value."""
         self.annotation: str | Expr | None = annotation
         """The attribute type annotation."""
+        self.setter: Function | None = None
+        """The setter linked to this property."""
+        self.deleter: Function | None = None
+        """The deleter linked to this property."""
 
     def as_dict(self, **kwargs: Any) -> dict[str, Any]:
         """Return this function's data as a dictionary.