[feature](mtmv)(3)Implementing multi table materialized views (#26146)

Introduction to Main Classes：
- MTMVService：MTMV services for other modules to call
- MTMVHookService：All operations that affect the MTMV
  - MTMVJobManager：All operations that affect the MTMV job
  - MTMVCacheManager：All operations that affect the MTMV Cache
- MTMVTask&MTMVJob：Inherit from job framework

fe/fe-common/src/main/java/org/apache/doris/common/Config.java

@@ -1586,15 +1586,16 @@ public class Config extends ConfigBase {
     @ConfField(description = {"任务堆积时用于存放定时任务的队列大小", "The number of timer jobs that can be queued."})
     public static int job_dispatch_timer_job_queue_size = 1024;
 
-    /**
-     * The number of threads used to consume insert tasks.
-     * if you have a lot of insert jobs,and the average execution frequency is relatively high you need to increase
-     * this value or increase the number of {@code @job_insert_task_queue_size}
-     * The value should be greater than 0, if it is 0 or <=0, set it to 5
-     */
-    @ConfField(description = {"用于执行 Insert 任务的线程数", "The number of threads used to consume insert tasks."})
+    @ConfField(description = {"用于执行 Insert 任务的线程数,值应该大于0，否则默认为5",
+            "The number of threads used to consume Insert tasks, "
+                    + "the value should be greater than 0, if it is <=0, default is 5."})
     public static int job_insert_task_consumer_thread_num = 10;
 
+    @ConfField(description = {"用于执行 MTMV 任务的线程数,值应该大于0，否则默认为5",
+            "The number of threads used to consume mtmv tasks, "
+                    + "the value should be greater than 0, if it is <=0, default is 5."})
+    public static int job_mtmv_task_consumer_thread_num = 10;
+
     /*---------------------- JOB CONFIG END------------------------*/
     /**
      * The number of async tasks that can be queued. @See TaskDisruptor