stdlib: fix many attributes which are read-only at runtime but read-write in the stub (#7395)

stdlib/inspect.pyi

@@ -357,9 +357,12 @@ class Parameter:
 
 class BoundArguments:
     arguments: OrderedDict[str, Any]
-    args: tuple[Any, ...]
-    kwargs: dict[str, Any]
-    signature: Signature
+    @property
+    def args(self) -> tuple[Any, ...]: ...
+    @property
+    def kwargs(self) -> dict[str, Any]: ...
+    @property
+    def signature(self) -> Signature: ...
     def __init__(self, signature: Signature, arguments: OrderedDict[str, Any]) -> None: ...
     def apply_defaults(self) -> None: ...
     def __eq__(self, other: object) -> bool: ...