Throw KapuaNotFoundException if device does not exist

[lorthirk]

When calling Device Events REST API, the response returns an empty list when the Device does not exist. With this PR a KapuaEntityNotFoundException will be returned instead, notifying that the Device could not be found.

Related Issue
No related issues

[codecov]

Codecov Report

Merging #2735 into develop will increase coverage by 0.01%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #2735      +/-   ##
=============================================
+ Coverage      54.53%   54.54%   +0.01%     
- Complexity      2990     3106     +116     
=============================================
  Files           1049     1049              
  Lines          29813    29813              
  Branches        2387     2387              
=============================================
+ Hits           16259    16262       +3     
+ Misses         12435    12431       -4     
- Partials        1119     1120       +1

Impacted Files	Coverage Δ	Complexity Δ
...e/registry/internal/DeviceRegistryServiceImpl.java	48.43% <0%> (-3.13%)	15% <0%> (-1%)
...ransport/mqtt/pooling/PooledMqttClientFactory.java	90% <0%> (+3.33%)	6% <0%> (ø)	⬇️
...a/org/eclipse/kapua/transport/mqtt/MqttClient.java	67.94% <0%> (+5.12%)	14% <0%> (+1%)	⬆️

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