Add BLE device scanning functionality

examples/device_scanner.py

@@ -0,0 +1,25 @@
+import asyncio
+import logging
+
+from findmy.scanner import OfflineFindingScanner
+
+logging.basicConfig(level=logging.INFO)
+
+
+async def scan():
+    scanner = await OfflineFindingScanner.create()
+
+    print("Scanning for FindMy-devices...")
+    print()
+
+    async for device in scanner.scan_for(10, extend_timeout=True):
+        print(f"Device - {device.mac_address}")
+        print(f"  Public key:   {device.adv_key_b64}")
+        print(f"  Lookup key:   {device.hashed_adv_key_b64}")
+        print(f"  Status byte:  {device.status:x}")
+        print(f"  Hint byte:    {device.hint:x}")
+        print()
+
+
+if __name__ == "__main__":
+    asyncio.run(scan())