feat(kitmw): limit maximum concurrency

[Reasno]

No description provided.

[codecov]

Codecov Report

Merging #67 (27e5f4c) into master (25bb3bd) will increase coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
+ Coverage   74.14%   74.36%   +0.22%     
==========================================
  Files          85       85              
  Lines        3024     3031       +7     
==========================================
+ Hits         2242     2254      +12     
+ Misses        599      592       -7     
- Partials      183      185       +2     

Impacted Files	Coverage Δ
kitmw/async.go	87.50% <100.00%> (+87.50%)	⬆️
config/watcher/file.go	58.13% <0.00%> (-4.66%)	⬇️

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