remove some raft lock for higer performance (#5451)

Co-authored-by: Sophie <84560950+Sophie-Xie@users.noreply.github.com>

src/kvstore/raftex/RaftPart.h

@@ -81,39 +81,34 @@ class RaftPart : public std::enable_shared_from_this<RaftPart> {
    * @brief Return whether RaftPart is running
    */
   bool isRunning() const {
-    std::lock_guard<std::mutex> g(raftLock_);
     return status_ == Status::RUNNING;
   }
 
   /**
    * @brief Return whether RaftPart is stopped
    */
   bool isStopped() const {
-    std::lock_guard<std::mutex> g(raftLock_);
     return status_ == Status::STOPPED;
   }
 
   /**
    * @brief Return whether RaftPart is leader
    */
   bool isLeader() const {
-    std::lock_guard<std::mutex> g(raftLock_);
     return role_ == Role::LEADER;
   }
 
   /**
    * @brief Return whether RaftPart is follower
    */
   bool isFollower() const {
-    std::lock_guard<std::mutex> g(raftLock_);
     return role_ == Role::FOLLOWER;
   }
 
   /**
    * @brief Return whether RaftPart is learner
    */
   bool isLearner() const {
-    std::lock_guard<std::mutex> g(raftLock_);
     return role_ == Role::LEARNER;
   }