Add ability set attributes for label of items in widgets `CheckboxList` and `RadioList`

[vjik]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[what-the-diff[bot]]

PR Summary

• Added Checkbox and Radio List Label Attributes Updated our software documentation with the notes on the new version 3.3.1 which now includes the ability for users to customize attributes for labels of items in the 'CheckboxList' and 'RadioList'. This enhancement provides more flexibility and control over how these widgets appear and function.

• Updated CheckboxItem, CheckboxList, RadioItem, and RadioList Classes Our developers have expanded the 'CheckboxItem' and 'RadioItem' classes with a new property called '$labelAttributes'. In addition, they added a new property for 'CheckboxList' and 'RadioList' called '$checkboxLabelAttributes' and '$radioLabelAttributes' respectively. Further, methods to manage these new properties have also been included, giving you more power to design your checkbox and radio lists as needed.

• New Tests for CheckboxListTest and RadioListTest Classes To ensure the above enhancements work as expected, new tests have been incorporated into 'CheckboxListTest' and 'RadioListTest' classes. These additions allow for checking the setting and merging of both checkbox and radio label attributes, assuring the robustness of our system updates.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (79a8c73) 100.00% compared to head (cd00517) 100.00%. Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #182 +/- ## =========================================== Coverage 100.00% 100.00% - Complexity 771 775 +4 =========================================== Files 85 85 Lines 2080 2098 +18 =========================================== + Hits 2080 2098 +18 ```

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