feat: add io.JoinWithTimeout

[Primetalk]

fix #88

[codecov]

Codecov Report

Base: 83.96% // Head: 84.15% // Increases project coverage by +0.19% 🎉

Coverage data is based on head (45822d7) compared to base (7ae957a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
+ Coverage   83.96%   84.15%   +0.19%     
==========================================
  Files          37       37              
  Lines        1815     1818       +3     
==========================================
+ Hits         1524     1530       +6     
+ Misses        253      251       -2     
+ Partials       38       37       -1     

Impacted Files	Coverage Δ
io/async.go	61.90% <ø> (ø)
io/fiber.go	82.14% <100.00%> (+0.66%)	⬆️
io/time.go	79.31% <100.00%> (+0.73%)	⬆️
io/channels.go	59.25% <0.00%> (+11.11%)	⬆️

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