Support child devices in all applicable cli commands (#1020)

Adds a new decorator that adds child options to a command and gets the
child device if the options are set.

- Single definition of options and error handling
- Adds options automatically to command
- Backwards compatible with `--index` and `--name`
- `--child` allows for id and alias for ease of use
- Omitting a value for `--child` gives an interactive prompt

Implements private `_update` to allow the CLI to patch a child `update`
method to call the parent device `update`.

Example help output:
```
$ kasa brightness --help
Usage: kasa brightness [OPTIONS] [BRIGHTNESS]

  Get or set brightness.

Options:
  --transition INTEGER
  --child, --name TEXT            Child ID or alias for controlling sub-
                                  devices. If no value provided will show an
                                  interactive prompt allowing you to select a
                                  child.
  --child-index, --index INTEGER  Child index controlling sub-devices
  --help                          Show this message and exit.
```

Fixes #769

kasa/device.py

@@ -338,9 +338,15 @@ class Device(ABC):
         """Returns the child devices."""
         return list(self._children.values())
 
-    def get_child_device(self, id_: str) -> Device:
-        """Return child device by its ID."""
-        return self._children[id_]
+    def get_child_device(self, name_or_id: str) -> Device | None:
+        """Return child device by its device_id or alias."""
+        if name_or_id in self._children:
+            return self._children[name_or_id]
+        name_lower = name_or_id.lower()
+        for child in self.children:
+            if child.alias and child.alias.lower() == name_lower:
+                return child
+        return None
 
     @property
     @abstractmethod