chore: disable monitor by default in config schema

Author: cmgzn

data_juicer/config/schema.py

@@ -511,10 +511,10 @@ class DJConfig(BaseModel):
     # tracer: tracing and insight mining
     # --------------------------------------------------------
     open_monitor: bool = Field(
-        default=True,
+        default=False,
         description=(
             "Whether to open the monitor to trace resource utilization for "
-            "each OP during data processing. It's True in default."
+            "each OP during data processing. It's False in default."
         ),
     )
     open_tracer: bool = Field(