[Feature] split extraction into multiple CSS bundles

[MaxMotovilov]

#322

I've been using this in production builds for 2+ months... are PRs still looked at, or is the shortage of maintainers critical?

[frehner]

I would love this feature too - I left a comment in #245, but essentially it seems this repo is in maintenance mode. Perhaps a couple of us could all work together to get some of these related PRs approved and merged?

[MaxMotovilov]

Wouldn't be able to publish though. Need a word from the current owner(s)...

[jinmingpang]

I have the same needs. we can not accept that put all styles in one single css file .～ Any progress ?