feat: prepare transform_insideRendering

[s-light]

Description

this pr adds the transform function insideRendering.
this runs after the parse and before the rendererer.render function.

this way you can tweak / manipulate the token Array -
including async operations.

Linked Issues

fixes #62

Additional context

please review my changes carefully.
i have a minimal working test at
https://github.com/s-light/unplugin-vue-markdown-playground
https://codesandbox.io/p/github/s-light/unplugin-vue-markdown-playground/main

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Updated dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/markdown-it-async@2.0.0 ➜ 2.1.0	None	0	11.8 kB	antfu

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[s-light]

i have no idea where the prismjs dependencie comes from 🙈

[s-light]

currently the dependency plugin-frontmatter needs to be fixed first - otherwise this breaks the frontmatter parsing 🙈