[Feature] Device Birth Extended Properties

[Coduz]

This PR adds the support for extendedProperties in Birth message sent from the device.

Related Issue
None

Description of the solution adopted
This PR adds mapping and resources to store the extendedProperties metric sent by Kura.
Those properties will be sent as an additional metric in the BIRTH message in a well defined JSON format.
Those properties are read and stored as an additional field of the Device entity to allow query easily those values.
Values from the device are not parsed (other than the value itself) nor there is logic on them because they can change from device to device.

Screenshots
Some screenshot of the new values in console.

Any side note on the changes made
Completed a bit the Javadocs of Device-related entities.

[codecov]

Codecov Report

Merging #3273 (1e35c09) into develop (7f08c8d) will increase coverage by 0.33%.
The diff coverage is 36.87%.

❗ Current head 1e35c09 differs from pull request most recent head 2667032. Consider uploading reports for the commit 2667032 to get more accurate results

@@              Coverage Diff              @@
##             develop    #3273      +/-   ##
=============================================
+ Coverage      25.47%   25.80%   +0.33%     
- Complexity       655      658       +3     
=============================================
  Files           1467     1470       +3     
  Lines          29943    30025      +82     
  Branches        2504     2507       +3     
=============================================
+ Hits            7629     7749     +120     
+ Misses         21716    21670      -46     
- Partials         598      606       +8     

Impacted Files	Coverage Δ	Complexity Δ
...e/device/lifecycle/KapuaBirthPayloadAttibutes.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...nternal/device/lifecycle/KapuaAppsPayloadImpl.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...evice/lifecycle/model/BirthExtendedProperties.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../device/lifecycle/model/BirthExtendedProperty.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../eclipse/kapua/service/device/registry/Device.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
...apua/service/device/registry/DeviceAttributes.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...pua/service/device/registry/DeviceXmlRegistry.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ce/device/registry/internal/DeviceFactoryImpl.java	25.00% <0.00%> (-29.55%)	0.00 <0.00> (ø)
...slator/kura/kapua/TranslatorLifeAppsKuraKapua.java	8.33% <0.00%> (-0.15%)	0.00 <0.00> (ø)
.../registry/internal/DeviceExtendedPropertyImpl.java	7.40% <7.40%> (ø)	0.00 <0.00> (?)
... and 42 more