letRun and thenRun

[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

[codecov[bot]]

Codecov Report

Merging #216 (a966022) into master (e792b26) will increase coverage by 0.12%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #216      +/-   ##
==========================================
+ Coverage   92.56%   92.68%   +0.12%     
==========================================
  Files          73       74       +1     
  Lines         659      670      +11     
==========================================
+ Hits          610      621      +11     
  Misses         49       49              

Impacted Files	Coverage Δ
...ackages/yak_runner/lib/src/extension/then_run.dart	100.00% <100.00%> (ø)

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