Correct handling of deeply nested attributes inside KapuaEntities

[Agnul97]

This PR extends a method inside ServiceDAO class that handles the extraction of deeply nested attributes inside kapuaEntities. Specifically, the method was limited to nested attributes up to 2 levels and this was a limitation for the querying of some attributes inside a particular table

[codecov]

Codecov Report

Merging #3665 (b3fed5f) into develop (7d7bd49) will decrease coverage by 16.25%.
The diff coverage is 100.00%.

❗ Current head b3fed5f differs from pull request most recent head d416427. Consider uploading reports for the commit d416427 to get more accurate results

@@              Coverage Diff               @@
##             develop    #3665       +/-   ##
==============================================
- Coverage      50.24%   33.98%   -16.26%     
+ Complexity       259      120      -139     
==============================================
  Files           1686     1686               
  Lines          32173    32179        +6     
  Branches        2643     2645        +2     
==============================================
- Hits           16164    10937     -5227     
- Misses         15066    20705     +5639     
+ Partials         943      537      -406     

Impacted Files	Coverage Δ
...pse/kapua/commons/service/internal/ServiceDAO.java	63.60% <100.00%> (-4.31%)	⬇️
...kapua/transport/mqtt/MqttResponseTimeoutTimer.java	0.00% <0.00%> (-100.00%)	⬇️
.../kapua/service/tag/internal/TagListResultImpl.java	0.00% <0.00%> (-100.00%)	⬇️
...pse/kapua/service/device/call/kura/KuraMethod.java	0.00% <0.00%> (-100.00%)	⬇️
...rt/mqtt/pooling/setting/MqttClientPoolSetting.java	0.00% <0.00%> (-100.00%)	⬇️
...ua/service/datastore/internal/schema/Metadata.java	0.00% <0.00%> (-100.00%)	⬇️
.../service/datastore/internal/model/DataIndexBy.java	0.00% <0.00%> (-100.00%)	⬇️
...qtt/pooling/setting/MqttClientPoolSettingKeys.java	0.00% <0.00%> (-100.00%)	⬇️
...rvice/endpoint/internal/EndpointInfoQueryImpl.java	0.00% <0.00%> (-100.00%)	⬇️
...vice/datastore/internal/DatastoreCacheManager.java	0.00% <0.00%> (-100.00%)	⬇️
... and 298 more