Custom item styles

[AydinHassan]

Allow to register custom items with styles, so that we can propagate styles for custom items.

[codecov-io]

Codecov Report

Merging #232 into master will decrease coverage by 0.1%.
The diff coverage is 90.47%.

@@             Coverage Diff             @@
##             master    #232      +/-   ##
===========================================
- Coverage     92.61%   92.5%   -0.11%     
- Complexity      611     626      +15     
===========================================
  Files            36      37       +1     
  Lines          1827    1882      +55     
===========================================
+ Hits           1692    1741      +49     
- Misses          135     141       +6

Impacted Files	Coverage Δ	Complexity Δ
src/Util/Collection.php	100% <100%> (ø)	6 <6> (?)
src/Style/Exception/InvalidStyle.php	100% <100%> (ø)	4 <1> (+1)	⬆️
src/CliMenu.php	94.17% <100%> (+0.11%)	116 <1> (+1)	⬆️
src/MenuItem/SplitItem.php	98.64% <100%> (+0.03%)	46 <0> (ø)	⬇️
src/Style/Locator.php	100% <100%> (ø)	13 <3> (+3)	⬆️
src/Util/ArrayUtils.php	100% <100%> (ø)	0 <0> (ø)	⬇️
src/Builder/SplitItemBuilder.php	75% <62.5%> (-2.5%)	14 <2> (+2)
src/Builder/CliMenuBuilder.php	71.07% <75%> (+0.2%)	77 <2> (+2)	⬆️

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