feat: use worker_threads by default for performance

[JounQin]

close #4

[changeset-bot]

🦋 Changeset detected

Latest commit: fd3dbee

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
synckit	Minor

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[codecov]

Codecov Report

Merging #23 (fd3dbee) into main (4a4287a) will decrease coverage by 2.81%.
The diff coverage is 95.83%.

@@             Coverage Diff             @@
##              main      #23      +/-   ##
===========================================
- Coverage   100.00%   97.18%   -2.82%     
===========================================
  Files            1        1              
  Lines           44       71      +27     
  Branches         8       17       +9     
===========================================
+ Hits            44       69      +25     
- Misses           0        2       +2     

Impacted Files	Coverage Δ
src/index.ts	97.18% <95.83%> (-2.82%)	⬇️

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