Allow setting log file

[Wh1isper]

#87

I found that plugin can add its own logger handler, so here we provide a simple configuration interface, if the plugin needs more features, just implement it on their own

[welcome]

Thanks for submitting your first pull request! You are awesome! 🤗

If you haven't done so already, check out Jupyter's Code of Conduct. Also, please make sure you followed the pull request template, as this will help us review your contribution more quickly.

You can meet the other Jovyans by joining our Discourse forum. There is also a intro thread there where you can stop by and say Hi! 👋

Welcome to the Jupyter community! 🎉

[Wh1isper]

Given that it is no longer maintained, I may consider maintaining this project myself (if I have a downstream project to follow)
#50 (comment)