[RL] Add destroy process group api (#9979)

python/sglang/srt/managers/io_struct.py

@@ -1094,6 +1094,17 @@ class InitWeightsUpdateGroupReqOutput:
     message: str
 
 
+@dataclass
+class DestroyWeightsUpdateGroupReqInput:
+    group_name: str = "weight_update_group"
+
+
+@dataclass
+class DestroyWeightsUpdateGroupReqOutput:
+    success: bool
+    message: str
+
+
 @dataclass
 class UpdateWeightVersionReqInput:
     # The new weight version