Implemented customer list API

[gbenziv]

Closes #159

• Added customermgmt screen

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 #184 (96e316a) into master (2699ef1) will increase coverage by 1.16%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
+ Coverage   89.61%   90.78%   +1.16%     
==========================================
  Files          43       43              
  Lines         780      792      +12     
==========================================
+ Hits          699      719      +20     
+ Misses         81       73       -8     

Impacted Files	Coverage Δ
...ore/domain/customermgmt/customermgmtcontroller.cpp	27.50% <100.00%> (+18.92%)	:arrow_up:
core/domain/unittest/test_customermgmt.cpp	100.00% <100.00%> (ø)
...nittest/mock/customermgmt/customermgmtdatamock.hpp	50.00% <0.00%> (+16.66%)	:arrow_up:
...nittest/mock/customermgmt/customermgmtviewmock.hpp	60.00% <0.00%> (+20.00%)	:arrow_up:
core/entity/customer.hpp	100.00% <0.00%> (+100.00%)	:arrow_up:

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