[Target][Detect] Add OpenCL device

This PR adds OpenCL device for automatic target detection.

python/tvm/target/detect_target.py

@@ -58,6 +58,17 @@ def _detect_rocm(dev: Device) -> Target:
     )
 
 
+def _detect_opencl(dev: Device) -> Target:
+    return Target(
+        {
+            "kind": "opencl",
+            "max_shared_memory_per_block": dev.max_shared_memory_per_block,
+            "max_threads_per_block": dev.max_threads_per_block,
+            "thread_warp_size": dev.warp_size,
+        }
+    )
+
+
 def _detect_vulkan(dev: Device) -> Target:
     f_get_target_property = get_global_func("device_api.vulkan.get_target_property")
     return Target(
@@ -99,7 +110,7 @@ def detect_target_from_device(dev: Union[str, Device]) -> Target:
     ----------
     dev : Union[str, Device]
         The device to detect the target for.
-        Supported device types: ["cuda", "metal", "rocm", "vulkan"]
+        Supported device types: ["cuda", "metal", "rocm", "vulkan", "opencl"]
 
     Returns
     -------
@@ -128,4 +139,5 @@ def detect_target_from_device(dev: Union[str, Device]) -> Target:
     "metal": _detect_metal,
     "vulkan": _detect_vulkan,
     "rocm": _detect_rocm,
+    "opencl": _detect_opencl,
 }