Refactor split item item selection and CliMenu can select checks.

[AydinHassan]

Also add tests for split item menu.

Hey @Lynesth can you check this out please :)

[codecov-io]

Codecov Report

Merging #138 into split-item-builder will increase coverage by 2.37%.
The diff coverage is 100%.

@@                   Coverage Diff                    @@
##             split-item-builder     #138      +/-   ##
========================================================
+ Coverage                 94.49%   96.87%   +2.37%     
- Complexity                  425      428       +3     
========================================================
  Files                        26       26              
  Lines                      1308     1311       +3     
========================================================
+ Hits                       1236     1270      +34     
+ Misses                       72       41      -31

Impacted Files	Coverage Δ	Complexity Δ
src/MenuItem/SplitItem.php	100% <100%> (ø)	41 <2> (+2)	⬆️
src/CliMenu.php	98.3% <100%> (+13.19%)	90 <1> (+1)	⬆️

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