YTORM-1384: Add overload controller to object service

commit_hash:d2821558020bab51a04d0c07ac3c06cec5c4911e

Author: dgolear

yt/yt/core/rpc/overload_controller.cpp

@@ -375,6 +375,11 @@ class TOverloadController
         Periodic_->Start();
     }
 
+    TFuture<void> Stop() override
+    {
+        return Periodic_->Stop();
+    }
+
     void TrackInvoker(
         TStringBuf name,
         const IInvokerPtr& invoker) override

yt/yt/core/rpc/overload_controller.h

@@ -40,6 +40,7 @@ struct IOverloadController
     DECLARE_INTERFACE_SIGNAL(void(), LoadAdjusted);
 
     virtual void Start() = 0;
+    virtual TFuture<void> Stop() = 0;
     virtual void Reconfigure(TOverloadControllerConfigPtr config) = 0;
 
     virtual void TrackInvoker(