Load: Fix InstanceAlreadyExistsException caused by concurrent registration on JMXService

[Caideyipi]

Description

Previously, the concurrent call to "registerMBean" or "deregisterMBean" may cause after 2 threads seeing the same state simultaneously, that one thread changes the state and make another one throw InstanceAlreadyExistsException or InstanceNotFoundException. This PR fixed this problem by adding synchronize to the 2 functions.

Log example when exception occurs:

2023-11-02 15:52:49,880 [pool-34-IoTDB-ClientRPC-Processor-44$20231102_075249_05132_1] ERROR o.a.i.c.s.JMXService:56 - Failed to registerMBean org.apache.iotdb.threadpool:type=org.apache.iotdb.db.queryengine.plan.scheduler.load.LoadTsFileDispatcherImpl
javax.management.InstanceAlreadyExistsException: org.apache.iotdb.threadpool:type=org.apache.iotdb.db.queryengine.plan.scheduler.load.LoadTsFileDispatcherImpl
        at java.management/com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:436)
        at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1855)
        at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:955)
        at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:890)
        at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:320)
        at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
        at org.apache.iotdb.commons.service.JMXService.registerMBean(JMXService.java:50)
        at org.apache.iotdb.commons.concurrent.threadpool.WrappedThreadPoolExecutor.<init>(WrappedThreadPoolExecutor.java:72)
        at org.apache.iotdb.commons.concurrent.IoTDBThreadPoolFactory.newCachedThreadPool(IoTDBThreadPoolFactory.java:149)
        at org.apache.iotdb.db.queryengine.plan.scheduler.load.LoadTsFileDispatcherImpl.<init>(LoadTsFileDispatcherImpl.java:82)
        at org.apache.iotdb.db.queryengine.plan.scheduler.load.LoadTsFileScheduler.<init>(LoadTsFileScheduler.java:127)
        at org.apache.iotdb.db.queryengine.plan.execution.QueryExecution.schedule(QueryExecution.java:321)
        at org.apache.iotdb.db.queryengine.plan.execution.QueryExecution.start(QueryExecution.java:233)
        at org.apache.iotdb.db.queryengine.plan.Coordinator.execute(Coordinator.java:160)
        at org.apache.iotdb.db.pipe.receiver.thrift.IoTDBThriftReceiverV1.executeStatement(IoTDBThriftReceiverV1.java:535)
        at org.apache.iotdb.db.pipe.receiver.thrift.IoTDBThriftReceiverV1.handleTransferFileSeal(IoTDBThriftReceiverV1.java:476)
        at org.apache.iotdb.db.pipe.receiver.thrift.IoTDBThriftReceiverV1.receive(IoTDBThriftReceiverV1.java:140)
        at org.apache.iotdb.db.pipe.receiver.thrift.IoTDBThriftReceiverAgent.receive(IoTDBThriftReceiverAgent.java:43)
        at org.apache.iotdb.db.protocol.thrift.impl.ClientRPCServiceImpl.pipeTransfer(ClientRPCServiceImpl.java:2555)
        at org.apache.iotdb.service.rpc.thrift.IClientRPCService$Processor$pipeTransfer.getResult(IClientRPCService.java:5467)
        at org.apache.iotdb.service.rpc.thrift.IClientRPCService$Processor$pipeTransfer.getResult(IClientRPCService.java:5447)
        at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:38)
        at org.apache.iotdb.db.protocol.thrift.ProcessorWithMetrics.process(ProcessorWithMetrics.java:64)
        at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:248)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at java.base/java.lang.Thread.run(Thread.java:834)