Implemented get customer details feature

[gbenziv]

Closes #160

• Created screen
• Added implementation in Core API
• Added unit tests

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 #185 (fbf4b99) into master (2699ef1) will increase coverage by 1.80%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #185      +/-   ##
==========================================
+ Coverage   89.61%   91.42%   +1.80%     
==========================================
  Files          43       43              
  Lines         780      816      +36     
==========================================
+ Hits          699      746      +47     
+ Misses         81       70      -11     

Impacted Files	Coverage Δ
...ore/domain/customermgmt/customermgmtcontroller.hpp	100.00% <ø> (ø)
...ore/domain/customermgmt/customermgmtcontroller.cpp	44.68% <100.00%> (+36.10%)	⬆️
core/domain/unittest/test_customermgmt.cpp	100.00% <100.00%> (ø)
core/domain/unittest/test_inventory.cpp	100.00% <100.00%> (ø)
...nittest/mock/customermgmt/customermgmtdatamock.hpp	50.00% <0.00%> (+16.66%)	⬆️
...nittest/mock/customermgmt/customermgmtviewmock.hpp	60.00% <0.00%> (+20.00%)	⬆️
core/entity/customer.hpp	100.00% <0.00%> (+100.00%)	⬆️

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