Tracker refactoring

[tagantroy]

I moved state transition handling from NoOpTracker to TestResultReporter
This MR is preparation for #186

[codecov-io]

Codecov Report

Merging #209 into develop will decrease coverage by 0.22%.
The diff coverage is 60%.

@@             Coverage Diff              @@
##             develop    #209      +/-   ##
============================================
- Coverage      58.62%   58.4%   -0.23%     
+ Complexity       340     339       -1     
============================================
  Files             97      97              
  Lines           1779    1784       +5     
  Branches         222     222              
============================================
- Hits            1043    1042       -1     
- Misses           616     622       +6     
  Partials         120     120

Impacted Files	Coverage Δ	Complexity Δ
...iy/marathon/analytics/tracker/DelegatingTracker.kt	100% <100%> (ø)	5 <1> (+1)	⬆️
...alinskiy/marathon/analytics/tracker/NoOpTracker.kt	100% <100%> (+24%)	5 <3> (-6)	⬇️
...kiy/marathon/execution/queue/TestResultReporter.kt	56.06% <50%> (-4.41%)	7 <4> (+4)

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[Malinskiy]

LGTM