feat: support for multiple inlined stylesheets in the same style tag

[wille]

This PR contains a:

• [ ] bugfix
• [x] new feature
• [ ] code refactor
• [ ] test update
• [ ] typo fix
• [ ] metadata update

Motivation / Use-Case

I have multiple CSS chunks in my web application and in some cases I want to inline more than one of these chunks into a single

Currently data-href does only support one href so I would have to create one style tag per chunk that is inlined which is not super convenient in my current stack.

<style data-href="/static/test.css,static/test2.css">

Breaking Changes

Additional Info

[jsf-clabot]

All committers have signed the CLA.

[codecov[bot]]

Codecov Report

Merging #586 (b28c5b8) into master (1565706) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #586   +/-   ##
=======================================
  Coverage   91.16%   91.16%           
=======================================
  Files           9        9           
  Lines         543      543           
  Branches      145      145           
=======================================
  Hits          495      495           
  Misses         44       44           
  Partials        4        4           

Impacted Files	Coverage Δ
src/index.js	90.04% <ø> (ø)

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[lsycxyj]

I suppose maybe you should do this by html plugin