native log rotation

[wey-gu]

NebulaGraph core instances came with builtin log rotation already, we should have a guide and conf explanation :-D

https://discuss.nebula-graph.com.cn/t/topic/13787/4?u=wey

[cooper-lzy]

After reading the replies at the end of the post, we can only use crontab to recycle log at the moment, first link to the solution in the FAQ in the logging docs, and then update the docs when support for using built-in parameters directly.

192b2bf

[wey-gu]

Thanks! @cooper-lzy Let's wait for vesoft-inc/nebula#5688 to enable further activities