feat(vue-renderer): use async fs

[pi0]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Refactors to use async FS operations for vue-renderer. Some over-optimizations for early cleanup of MFS removed to reduce complexity, more consistency (not isMFS) and less dependency on webpack specific MFS implementation.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[clarkdo]

We should await all build:resources hook call and remove isMfs as well 😃

[pi0]

@clarkdo Promises are chained for hooks (Arrow function return shorthand)

[clarkdo]

@pi0 I mean the call of hook, like here, but it seemed all calls are await, so only removing isMFS is enough.

[codecov-io]

Codecov Report

Merging #5186 into dev will increase coverage by 0.01%.
The diff coverage is 97.43%.

@@            Coverage Diff             @@
##              dev    #5186      +/-   ##
==========================================
+ Coverage   96.52%   96.53%   +0.01%     
==========================================
  Files          72       73       +1     
  Lines        2447     2456       +9     
  Branches      620      619       -1     
==========================================
+ Hits         2362     2371       +9     
  Misses         70       70              
  Partials       15       15

Impacted Files	Coverage Δ
packages/webpack/src/builder.js	94.68% <100%> (ø)	⬆️
packages/vue-renderer/src/renderer.js	95.26% <100%> (+0.44%)	⬆️
packages/server/src/server.js	100% <100%> (ø)	⬆️
packages/webpack/src/utils/async-mfs.js	90.9% <90.9%> (ø)

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