yak runner iterable

[iapicca]

• [yak_utils] implemnt and test LetX and LetAsyncX
• [yak_utils] fix Cache
• [yak_utils] fix Cache (1)
• [yak_result] move thenRun extension
• [yak_runner] implement and test letRun and thenRun
• [yak_runner] update pubspec and changelog
• [yak_runner] add forEachRun
• [yak_utils] remove letAsync (it is just 'then')
• [yak_runner] bugfix for VoidResultThenRunX
• [yak_utils] bugfix for LetX

[codecov[bot]]

Codecov Report

Merging #219 (ba837ee) into master (4587e77) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #219   +/-   ##
=======================================
  Coverage   92.93%   92.93%           
=======================================
  Files          74       74           
  Lines         665      665           
=======================================
  Hits          618      618           
  Misses         47       47           

Impacted Files	Coverage Δ
packages/yak_utils/lib/src/extensions/let.dart	100.00% <100.00%> (ø)

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