add support for polardbx multi binlog streams (#4660)

* AbstractCanalInstance的subscribeChange方法，增加对AbstractEventParser的类型判断，以支持用户的自定义CanalEventParser

* MysqlEventParser对Gtid模式的处理需要考虑兼容性，支持系统平滑的从非gtid模式升级为gtid模式

* add support for polardbx multi binlog streams #4657

* support auto generate instance names #4657

instance/manager/src/main/java/com/alibaba/otter/canal/instance/manager/CanalInstanceWithManager.java

@@ -329,6 +329,7 @@ public class CanalInstanceWithManager extends AbstractCanalInstance {
             mysqlEventParser.setFilterTableError(parameters.getFilterTableError());
             mysqlEventParser.setParallel(parameters.getParallel());
             mysqlEventParser.setIsGTIDMode(BooleanUtils.toBoolean(parameters.getGtidEnable()));
+            mysqlEventParser.setMultiStreamEnable(parameters.getMultiStreamEnable());
             // tsdb
             if (parameters.getTsdbSnapshotInterval() != null) {
                 mysqlEventParser.setTsdbSnapshotInterval(parameters.getTsdbSnapshotInterval());

instance/manager/src/main/java/com/alibaba/otter/canal/instance/manager/model/CanalParameter.java

@@ -124,6 +124,8 @@ public class CanalParameter implements Serializable {
     private String                   alarmHandlerClass                  = null;
     //自定义alarmHandler插件文件夹路径
     private String                   alarmHandlerPluginDir              = null;
+    //是否支持多流消费
+    private Boolean                  multiStreamEnable                  = Boolean.FALSE;
 
     public static enum RunMode {
 
@@ -1012,6 +1014,14 @@ public class CanalParameter implements Serializable {
         this.alarmHandlerPluginDir = alarmHandlerPluginDir;
     }
 
+    public Boolean getMultiStreamEnable() {
+        return multiStreamEnable;
+    }
+
+    public void setMultiStreamEnable(Boolean multiStreamEnable) {
+        this.multiStreamEnable = multiStreamEnable;
+    }
+
     public String toString() {
         return ToStringBuilder.reflectionToString(this, CanalToStringStyle.DEFAULT_STYLE);
     }