💥 KapuaListResult is now concrete, as are all subclasses (needed…

[dseurotech]

… only to provide xml annotations), avoiding the split between interfaces and implementations

Brief description of the PR.
[e.g. Added null check on object to avoid NullPointerException]

Related Issue
This PR fixes/closes {issue number}

Description of the solution adopted
A more detailed description of the changes made to solve/close one or more issues.
If the PR is simple and easy to understand this section can be skipped.

Screenshots
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Any side note on the changes made
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[codecov]

Codecov Report

Attention: Patch coverage is 38.50932% with 198 lines in your changes missing coverage. Please review.

Project coverage is 16.57%. Comparing base (d795152) to head (d53f77d).
Report is 11 commits behind head on develop.

Files with missing lines	Patch %	Lines
...pse/kapua/commons/service/internal/ServiceDAO.java	0.00%	56 Missing ⚠️
.../kapua/service/datastore/steps/DatastoreSteps.java	0.00%	43 Missing ⚠️
...kapua/commons/rest/filters/CORSResponseFilter.java	0.00%	8 Missing ⚠️
...kapua/model/query/KapuaForwardableEntityQuery.java	50.00%	5 Missing and 1 partial ⚠️
...service/event/store/api/EventStoreRecordQuery.java	0.00%	5 Missing ⚠️
.../app/api/resources/v1/resources/JobExecutions.java	0.00%	5 Missing ⚠️
...pua/service/account/steps/AccountServiceSteps.java	0.00%	5 Missing ⚠️
...onfiguration/AbstractKapuaConfigurableService.java	0.00%	4 Missing ⚠️
...service/internal/KapuaNamedEntityServiceUtils.java	0.00%	4 Missing ⚠️
...urces/v1/resources/DeviceManagementOperations.java	0.00%	4 Missing ⚠️
... and 41 more

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #4170      +/-   ##
=============================================
- Coverage      16.71%   16.57%   -0.14%     
  Complexity        22       22              
=============================================
  Files           2039     2020      -19     
  Lines          53018    52846     -172     
  Branches        4453     4454       +1     
=============================================
- Hits            8860     8759     -101     
+ Misses         43755    43684      -71     
  Partials         403      403              

Files with missing lines	Coverage Δ
.../java/org/eclipse/kapua/commons/CommonsModule.java	76.19% <ø> (-1.09%)	⬇️
...service/event/store/api/EventStoreXmlRegistry.java	50.00% <ø> (+16.66%)	⬆️
...ce/event/store/internal/EventStoreFactoryImpl.java	100.00% <ø> (ø)
...re/internal/EventStoreRecordImplJpaRepository.java	100.00% <100.00%> (ø)
...ua/commons/service/internal/cache/EntityCache.java	22.78% <ø> (ø)
...ob/engine/queue/QueuedJobExecutionXmlRegistry.java	0.00% <ø> (ø)
.../kapua/app/api/web/RestApiJAXBContextProvider.java	0.00% <ø> (ø)
.../kapua/service/account/xml/AccountXmlRegistry.java	50.00% <ø> (+12.50%)	⬆️
...a/service/account/internal/AccountFactoryImpl.java	10.00% <ø> (+1.66%)	⬆️
...ice/account/internal/AccountImplJpaRepository.java	25.00% <100.00%> (ø)
... and 63 more

... and 256 files with indirect coverage changes