Add support for selecting individual iterations

[marcphilipp]

Individual iterations can now be selected via their unique ID.

Co-authored-by: Leonard Brünings lbruenings@gradle.com

[codecov]

Codecov Report

Merging #1376 (bc207c9) into master (6cf09c6) will increase coverage by 0.06%.
The diff coverage is 93.18%.

@@             Coverage Diff              @@
##             master    #1376      +/-   ##
============================================
+ Coverage     79.26%   79.33%   +0.06%     
- Complexity     3950     3966      +16     
============================================
  Files           402      403       +1     
  Lines         12290    12320      +30     
  Branches       1625     1626       +1     
============================================
+ Hits           9742     9774      +32     
+ Misses         1965     1962       -3     
- Partials        583      584       +1     

Impacted Files	Coverage Δ
.../spockframework/runtime/model/IterationFilter.java	91.66% <91.66%> (ø)
...spockframework/runtime/MethodSelectorResolver.java	90.69% <92.85%> (+12.12%)	⬆️
...ework/runtime/PlatformParameterizedSpecRunner.java	77.94% <100.00%> (+0.16%)	⬆️
.../org/spockframework/runtime/model/FeatureInfo.java	98.27% <100.00%> (+0.06%)	⬆️
...spockframework/runtime/SpockComparisonFailure.java	100.00% <0.00%> (+16.66%)	⬆️

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