Add get weights by parameter name for llama (#2266)

python/sglang/srt/managers/io_struct.py

@@ -365,6 +365,17 @@ class UpdateWeightFromDiskReqOutput:
     message: str
 
 
+@dataclass
+class GetWeightsByNameReqInput:
+    name: str
+    truncate_size: int = 100
+
+
+@dataclass
+class GetWeightsByNameReqOutput:
+    parameter: list
+
+
 @dataclass
 class AbortReq:
     # The request id