SQL语句优先级实现方式
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Description
TiDB 支持改变 [per-session](https://docs.pingcap.com/zh/tidb/stable/system-variables#tidb_force_priority)、[全局](https://docs.pingcap.com/zh/tidb/stable/tidb-configuration-file#force-priority)或单个语句的优先级。优先级包括：
HIGH_PRIORITY：该语句为高优先级语句，TiDB 在执行阶段会优先处理这条语句
LOW_PRIORITY：该语句为低优先级语句，TiDB 在执行阶段会降低这条语句的优先级
上述描述的SQL语句的优先级是如何实现的、比如是降低线程数还是减少CPU时间片、暂停IO等方式？
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