Add Python test scripts for CAN communication

- Created `python_can.py`:
  - Implements a CAN message receiver that processes angle, velocity, and enable/disable flags.
- Added `python_enable_motor.py`:
  - Sends enable/disable commands to the motor via CAN.
- Added `python_send_angle.py`:
  - Sends target angle commands over the CAN bus.
- Added `python_send_velocity.py`:
  - Sends target velocity commands over the CAN bus.
- Configured all scripts to use `python-can` library with `socketcan` interface for CAN communication.

controller/fw/embed/test/python_can.py

@@ -0,0 +1,47 @@
+import can
+import struct
+import time
+
+def process_can_message(msg):
+    if msg.dlc == 5:  # Check the message length
+        print(f"Received message with ID: {msg.arbitration_id}")
+        print(f"Data: {msg.data}")
+
+        # The first byte determines the data type (flag)
+        flag = chr(msg.data[0])
+        
+        if flag == 'A':  # Angle
+            angle_bytes = msg.data[1:5]
+            angle = struct.unpack('<f', bytes(angle_bytes))[0]
+            print(f"Angle: {angle} degrees")
+        elif flag == 'V':  # Velocity
+            velocity_bytes = msg.data[1:5]
+            velocity = struct.unpack('<f', bytes(velocity_bytes))[0]
+            print(f"Velocity: {velocity} rad/s")
+        elif flag == 'E' and msg.dlc >= 2:  # Enable/Disable
+            enabled = msg.data[1]  # Expecting 1 byte (0 or 1)
+            print(f"Enabled: {bool(enabled)}")
+        else:
+            print(f"Unknown flag: {flag}")
+    else:
+        print(f"Received message with unexpected length: {msg.dlc}")
+
+def receive_can_messages():
+    try:
+        # Connect to the CAN bus
+        bus = can.interface.Bus(channel='can0', bustype='socketcan')
+
+        print("Waiting for messages on the CAN bus...")
+
+        while True:
+            msg = bus.recv()
+            if msg:
+                process_can_message(msg)
+
+    except KeyboardInterrupt:
+        print("\nExiting program...")
+    except Exception as e:
+        print(f"Error: {e}")
+
+if __name__ == '__main__':
+    receive_can_messages()