feat!: allow async $resolve

[pi0]

Context: nuxt/framework#7439

This PR Allows $resolve function return a promise.

While it is possible to try to make sync version of resolvers, in the future it would be harder and harder to do this.

Breaking change: resolveSchema and applyDefaults returns a Promise now.

Breaking change: get function passed to $resolve also returns a Promise. $resolve: (val, get) => get('key') should be $resolve: async (val, get) => await get('key')

[codecov]

Codecov Report

Merging #50 (1502bc5) into main (40a4035) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 1502bc5 differs from pull request most recent head 90c7a27. Consider uploading reports for the commit 90c7a27 to get more accurate results

@@           Coverage Diff           @@
##             main      #50   +/-   ##
=======================================
  Coverage   84.64%   84.64%           
=======================================
  Files           8        8           
  Lines         918      918           
  Branches      239      239           
=======================================
  Hits          777      777           
  Misses        141      141           

Impacted Files	Coverage Δ
src/schema.ts	100.00% <100.00%> (ø)
src/types.ts	100.00% <100.00%> (ø)

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