refactor: remove builder coupling from server

[pi0]

Changes:

• Move middleware for dev (devMiddleware and hotMiddleware) into @nuxt/builder:builder.middleware() and just keep a placeholder inside @nuxt/server
• Don't call nuxt.ready() in constructor anymore
• Don't create a server during nuxt build or when options.server is false

[Atinux]

😍😍😍

[codecov-io]

Codecov Report

Merging #5157 into dev will decrease coverage by 0.22%.
The diff coverage is 88.23%.

@@            Coverage Diff             @@
##              dev    #5157      +/-   ##
==========================================
- Coverage   96.57%   96.35%   -0.23%     
==========================================
  Files          73       73              
  Lines        2456     2472      +16     
  Branches      619      626       +7     
==========================================
+ Hits         2372     2382      +10     
- Misses         69       75       +6     
  Partials       15       15

Impacted Files	Coverage Δ
packages/builder/src/builder.js	100% <ø> (ø)	⬆️
packages/cli/src/command.js	98.87% <ø> (ø)	⬆️
packages/webpack/src/builder.js	94.94% <100%> (+0.26%)	⬆️
packages/cli/src/commands/dev.js	88% <100%> (+0.5%)	⬆️
packages/cli/src/commands/build.js	86.36% <100%> (ø)	⬆️
packages/vue-renderer/src/renderer.js	94.84% <50%> (-0.95%)	⬇️
packages/server/src/server.js	97.72% <86.66%> (-2.28%)	⬇️
packages/core/src/nuxt.js	94.44% <88.23%> (-5.56%)	⬇️

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[galvez]

Good stuff, I can see where you're going with this :)

[clarkdo]

Did I see Chinese ? @pi0 😄