雪花生成器增加一个构造方法.

https://github.com/baomidou/mybatis-plus/issues/1810

mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/incrementer/SnowflakeIdGenerator.java

@@ -35,6 +35,10 @@ public class SnowflakeIdGenerator implements IdGenerator {
         this.sequence = new Sequence(workerId, dataCenterId);
     }
 
+    public SnowflakeIdGenerator(Sequence sequence) {
+        this.sequence = sequence;
+    }
+
     @Override
     public long nextId(Object entity) {
         return sequence.nextId();