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Describe what this PR does / why we need it
实现 #2935 中的功能
1. dashborad后台变动
增加
MetricsExtRepository接口, 默认继承MetricsRepository, 可以传递查询参数,方便扩展。内存储存实现中增加五分钟统计维度( 使用最近的一个5分整点时间进行统计,如: 12:05,12:10, 12:15...)
内置默认按秒统计过期策略保持不变, 5分钟维度统计数据过期时间默认1天(内存也储存288条数据)
可通过
sentinel.dashboard.store.maxMetricLiveTimeOfMin5配置进行配置过期时间2. dashborad前端变动
管理后台增加五分钟维度展示(可切换),

增加全局资源统计展示

可通过异常列,成功列,失败列进行排序