若依集成xxl-job
对xxl-job进行增加： 1. 支持多租户； 2. 权限增加，对执行器允许分配只读权限，能看，不能操作； 3. 性能提升，支持横向扩容，每个xxl-job-admin仅负责部分job的触发； 4. 预警增加，允许预期信息发到企业微信、钉钉、飞书； 5. 执行器日志，允许配置保存到数据库；
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