add dlpack_device dunder to the F32_device

Author: ev-br

array_api_strict/_devices.py

@@ -43,12 +43,14 @@ def _supported_dtypes(self) -> list[DType]:
 class DLDeviceType(IntEnum):
     kDLCPU = 1
     kDLCUDA = 2
+    kDLMETAL = 8
 
 
 _DLPACK_DEVICE_FOR: Final[dict[Device, tuple[DLDeviceType, int]]] = {
     CPU_DEVICE: (DLDeviceType.kDLCPU, 0),
     Device("device1"): (DLDeviceType.kDLCUDA, 0),
     Device("device2"): (DLDeviceType.kDLCUDA, 1),
+    _F32_DEVICE: (DLDeviceType.kDLMETAL, 0),
 }
 
 _DLPACK_DEVICE_TO_LOGICAL: Final[dict[tuple[int, int], Device]] = {