Action result dependent compensation #13 #10

[VladKopanev]

This PR adds new functions: more powerful compensate that allows compensation action to be dependent on the result of associated action and also another two functions derived from this: compensateIfFail and compensateIfSuccess.
compensateIfFail would execute compensation action only if associated action fails. compensateIfSuccess would execute compensation action only if associated action succeeds.

[codecov-io]

Codecov Report

Merging #19 into master will increase coverage by 8.48%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   86.11%   94.59%   +8.48%     
==========================================
  Files           1        1              
  Lines          36       37       +1     
==========================================
+ Hits           31       35       +4     
+ Misses          5        2       -3

Impacted Files	Coverage Δ
...src/main/scala/com/vladkopanev/zio/saga/Saga.scala	94.59% <88.88%> (+8.48%)	⬆️

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