Add UsbHandler

This handler runs callback on usb events.

When a usb is connected following events will capture:
 - add
 - change
 - add
 - bind
 - bind

and when usb mouse is removed following will captured:
- unbind
- remove
- unbind
- remove

these effects are tested with device logitech (R) B100 mouse.

src/scripts/python/udevhandle.py

@@ -1,5 +1,5 @@
 from abc import ABC, abstractmethod
-from pyudev import Context, Monitor, MonitorObserver
+from pyudev import Context, Monitor, MonitorObserver, Device
 
 
 class Handler(ABC):
@@ -26,7 +26,7 @@ class Handler(ABC):
         self.observer.start()
 
     @abstractmethod
-    def callback(self, device):
+    def callback(self, device: Device):
         """Callback
 
         This method must be implemented by child calsses. This method is
@@ -44,3 +44,22 @@ class Handler(ABC):
             device (pyudev.Device): modified device passed by self.observer
         """
         self.callback(device)
+
+
+class MouseHandler(Handler):
+    def __init__(self) -> None:
+        """Initiate UsbHanlder
+
+        Initialization contains two major steps. First it would do a
+        configuration for currently available devices and then it would wait for
+        USB udev events to reconfigure the settings. configurations would be
+        done by (This part is not decided yet. it could be done by BASH SCRIPTS
+        or we can invoke xinput binaries via python itself. a bash script
+        solution would be benefitial since it can used as utility).
+        """
+        # TODO: use somthing that only captures 
+        super().__init__('usb')
+
+
+    def callback(self, device):
+        print(device.action)