JobStepRegistry readonly REST API

[lorthirk]

After merging #2789 we had no way to retrieve Job Steps for a given Job. This PR introduces a few endpoints:

• GET {scopeId}/jobs/{jobId}/steps
• GET {scopeId}/jobs/{jobId}/steps/{stepId}
• POST {scopeId}/jobs/{jobId}/steps/_count
• POST {scopeId}/jobs/{jobId}/steps/_query

Related Issue
To be merged after #2789

[codecov]

Codecov Report

Merging #2790 into develop will increase coverage by 1.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             develop   #2790      +/-   ##
============================================
+ Coverage      56.42%   57.5%   +1.07%     
- Complexity      3073    3396     +323     
============================================
  Files           1074    1074              
  Lines          30500   30500              
  Branches        2435    2435              
============================================
+ Hits           17211   17538     +327     
+ Misses         12153   11791     -362     
- Partials        1136    1171      +35

Impacted Files	Coverage Δ	Complexity Δ
...lugin/authentication/AdminAuthenticationLogic.java	69.23% <0%> (-7.7%)	0% <0%> (ø)
...egistry/event/internal/DeviceEventServiceImpl.java	76.78% <0%> (-5.36%)	13% <0%> (-2%)
...e/kapua/job/engine/jbatch/driver/JbatchDriver.java	69.74% <0%> (+0.84%)	21% <0%> (+1%)	⬆️
.../eclipse/kapua/qa/common/SimulatedDeviceSteps.java	94.24% <0%> (+1.04%)	60% <0%> (ø)	⬇️
.../broker/core/plugin/KapuaSecurityBrokerFilter.java	75.23% <0%> (+1.23%)	0% <0%> (ø)	⬇️
...e/kapua/broker/core/plugin/metric/LoginMetric.java	86.66% <0%> (+2.22%)	0% <0%> (ø)	⬇️
.../org/eclipse/kapua/qa/common/cucumber/CucUser.java	42.85% <0%> (+2.38%)	12% <0%> (+1%)	⬆️
...n/java/org/eclipse/kapua/qa/common/BasicSteps.java	57.5% <0%> (+2.5%)	19% <0%> (+4%)	⬆️
...lipse/kapua/kura/simulator/MqttAsyncTransport.java	55.55% <0%> (+2.77%)	0% <0%> (ø)	⬇️
...n/java/org/eclipse/kapua/qa/common/Suppressed.java	51.72% <0%> (+3.44%)	12% <0%> (+1%)	⬆️
... and 14 more

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