switch from hardware object to string

and replace mac address to disk serial number
for more predictable hash key

Azaion.Inference/hardware_service.pxd

@@ -1,11 +1,6 @@
-cdef class HardwareInfo:
-    cdef str cpu, gpu, memory, mac_address
-    cdef to_json_object(self)
-
 cdef class HardwareService:
     cdef bint is_windows
-    cdef get_mac_address(self, interface=*)
 
     @staticmethod
     cdef has_nvidia_gpu()
-    cdef HardwareInfo get_hardware_info(self)
+    cdef str get_hardware_info(self)