fix:bug in time statistics format

[YuCai18]

#3131

pika3.5中该bug复现

原因分析

慢日志明确给出了 210 µs 的耗时，而 info all # Commandstats 对应的 usec_per_call 只有 0.21，这一千倍的差距说明统计值在输出前被 /1000 误换算成了毫秒，因此当前版本的 Commandstats 单位实际上是毫秒，符合 issue #3131 的描述。

修改位置

在 src/pika_admin.cc 中将 MethodofCommandStatistics 与 MethodofTotalTimeCalculation 里把 time_consuming / 1000.0 直接改为 static_cast(time_consuming)，去掉这一步除法即可恢复为真正的微秒单位，重新编译后 info all 中的 usec 与 usec_per_call 将与 slowlog 完全一致。

修复后截图

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