feat: first class hmr

[ineshbose]

previously worked on in #795, then reverted #817

Test on Stackblitz: https://stackblitz.com/github/nuxt-modules/tailwindcss/tree/first-class-hmr

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closes #682 and closes #826

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[ineshbose]

Expose config templates may not change.. need to look into that

[ineshbose]

tailwindcss:resolvedConfig hook is broken now 🔪😃👍

[ineshbose]

need to consider using unctx or something now

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[ineshbose]

on fresh setup without prepare, some styling is flashing and I may not be too happy with how objects are copied while needing to be passed in configMerger (there's lot of complexity here as well..)

[ineshbose]

Just build now not detecting added templates...

[ineshbose]

I've been in half minds around writing tests.. may write them or release soon

[ineshbose]

minor improvement if needed in future - do findPath within loadConfig and also listen for 'add' event from builder in that case. Templates are already triggering due to templatesGenerated hook 👍