Implemented category sales feature

[gbenziv]

xxxx

• Added controller, screen, and data implementation
• Added new functions to datetime
• Added category to entity::SaleItem

Pull Request Checklist

• [x] I have ensured that my commit message contains the Issue ID.
• [x] I have ensured that my commit message contains the feature/bugfix description.
• [ ] I have updated the documentation accordingly.
• [x] I have ensured my code follows the coding guidelines.
• [x] I have ran lint in my code locally prior to submission.
• [x] I have built my changes in local successfully.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #239 (a1186e5) into master (9f05930) will increase coverage by 0.57%. The diff coverage is 98.79%.

@@            Coverage Diff             @@
##           master     #239      +/-   ##
==========================================
+ Coverage   94.89%   95.47%   +0.57%     
==========================================
  Files          65       65              
  Lines        1234     1303      +69     
==========================================
+ Hits         1171     1244      +73     
+ Misses         63       59       -4     

Impacted Files	Coverage Δ
core/domain/accounting/accountingcontroller.hpp	100.00% <ø> (ø)
core/domain/inventory/interface/inventoryiface.hpp	100.00% <ø> (ø)
core/domain/inventory/inventorycontroller.hpp	100.00% <ø> (ø)
core/entity/saleitem.hpp	100.00% <ø> (+100.00%)	:arrow_up:
core/validator/productvalidator.hpp	100.00% <ø> (ø)
core/validator/uservalidator.hpp	100.00% <ø> (ø)
utility/datetime/datetime.hpp	100.00% <ø> (ø)
core/domain/accounting/accountingcontroller.cpp	85.18% <95.45%> (+3.21%)	:arrow_up:
core/domain/employeemgmt/employeecontroller.cpp	95.95% <100.00%> (ø)
core/domain/inventory/inventorycontroller.cpp	98.16% <100.00%> (+0.29%)	:arrow_up:
... and 6 more

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