Crypto utils tests

[Coduz]

This PR adds test for CryptoUtil class.

The aim, other than the basic testing, is to ensure that components used to encrypt/decrypt will be compatible between releases and component version upgrades.

Related Issue
None

Description of the solution adopted
Added tests!

Screenshots
None

Any side note on the changes made
None

[codecov]

Codecov Report

Merging #3582 (0926ea0) into develop (f25db7a) will decrease coverage by 3.66%.
The diff coverage is n/a.

❗ Current head 0926ea0 differs from pull request most recent head 3ef8bd9. Consider uploading reports for the commit 3ef8bd9 to get more accurate results

@@              Coverage Diff              @@
##             develop    #3582      +/-   ##
=============================================
- Coverage      50.07%   46.40%   -3.67%     
+ Complexity       259      184      -75     
=============================================
  Files           1662     1662              
  Lines          31940    31940              
  Branches        2643     2643              
=============================================
- Hits           15994    14822    -1172     
- Misses         15010    16278    +1268     
+ Partials         936      840      -96     

Impacted Files	Coverage Δ
...a/org/eclipse/kapua/commons/crypto/CryptoUtil.java	76.19% <ø> (+31.74%)	⬆️
...del/query/predicate/ChannelMatchPredicateImpl.java	0.00% <0.00%> (-100.00%)	⬇️
...ent/packages/message/internal/PackageResource.java	0.00% <0.00%> (-100.00%)	⬇️
...kages/model/internal/DevicePackageOptionsImpl.java	0.00% <0.00%> (-100.00%)	⬇️
...l/setting/PackageManagementServiceSettingKeys.java	0.00% <0.00%> (-100.00%)	⬇️
...oad/internal/DevicePackageDownloadOptionsImpl.java	0.00% <0.00%> (-100.00%)	⬇️
...lator/app/deploy/DeploymentPackageInformation.java	0.00% <0.00%> (-93.75%)	⬇️
...internal/DeviceManagementOperationCreatorImpl.java	0.00% <0.00%> (-92.86%)	⬇️
...g/eclipse/kapua/kura/simulator/util/Documents.java	0.00% <0.00%> (-88.24%)	⬇️
...ura/kapua/TranslatorAppConfigurationKuraKapua.java	4.22% <0.00%> (-87.33%)	⬇️
... and 94 more