Changed validation result type from std::unordered_map to std::map

[gbenziv]

Closes #179

• Changed type
• Changed map insert to merge

Pull Request Checklist

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

[codecov]

Codecov Report

Merging #180 (5ab08c4) into master (a933054) will decrease coverage by 4.99%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #180      +/-   ##
==========================================
- Coverage   94.61%   89.61%   -5.00%     
==========================================
  Files          37       43       +6     
  Lines         724      780      +56     
==========================================
+ Hits          685      699      +14     
- Misses         39       81      +42     

Impacted Files	Coverage Δ
core/entity/customer.hpp	0.00% <0.00%> (ø)
core/entity/employee.hpp	100.00% <ø> (ø)
core/validator/validator.hpp	100.00% <ø> (ø)
...ore/domain/customermgmt/customermgmtcontroller.cpp	8.57% <8.57%> (ø)
...nittest/mock/customermgmt/customermgmtdatamock.hpp	33.33% <33.33%> (ø)
...nittest/mock/customermgmt/customermgmtviewmock.hpp	40.00% <40.00%> (ø)
...ore/domain/customermgmt/customermgmtcontroller.hpp	100.00% <100.00%> (ø)
core/domain/employeemgmt/employeecontroller.cpp	96.36% <100.00%> (ø)
core/domain/inventory/inventorycontroller.cpp	95.71% <100.00%> (ø)
core/domain/unittest/test_customermgmt.cpp	100.00% <100.00%> (ø)
... and 6 more

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