Default sorting for Datastore REST API simple queries

[lorthirk]

This PR adds default sorting for the Datastore queries:

• MessageQueryImpl: sort by timestamp DESC
• MetricInfoQueryImpl: sort by name ASC
• ChannelInfoQueryImpl: sort by channel ASC
• ClientInfoQueryImpl: sort by client_id ASC

Related Issue
This PR closes #2665

[codecov]

Codecov Report

Merging #2666 into develop will decrease coverage by 6.44%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##             develop    #2666      +/-   ##
=============================================
- Coverage      53.06%   46.62%   -6.45%     
+ Complexity      2831     2426     -405     
=============================================
  Files           1024     1024              
  Lines          28815    28817       +2     
  Branches        2331     2331              
=============================================
- Hits           15292    13436    -1856     
- Misses         12477    14369    +1892     
+ Partials        1046     1012      -34

Impacted Files	Coverage Δ	Complexity Δ
...datastore/internal/mediator/DatastoreMediator.java	83.33% <ø> (-4.51%)	14 <0> (-2)
...tore/internal/model/query/ClientInfoQueryImpl.java	55.55% <100%> (+5.55%)	3 <0> (ø)	⬇️
...ore/internal/model/query/ChannelInfoQueryImpl.java	50% <100%> (+5.55%)	3 <0> (ø)	⬇️
...tastore/internal/model/query/MessageQueryImpl.java	76.92% <100%> (+0.92%)	6 <0> (ø)	⬇️
...tore/internal/model/query/MetricInfoQueryImpl.java	41.66% <100%> (+5.3%)	3 <0> (ø)	⬇️
.../kapua/service/datastore/steps/DatastoreSteps.java	25.82% <0%> (-63.08%)	53% <0%> (-176%)
...nternal/model/query/ChannelMatchPredicateImpl.java	0% <0%> (-61.54%)	0% <0%> (-2%)
...authorization/steps/AuthorizationServiceSteps.java	30.8% <0%> (-57.35%)	54% <0%> (-83%)
...store/internal/MetricInfoRegistryServiceProxy.java	42.85% <0%> (-57.15%)	2% <0%> (-2%)
...tore/internal/ChannelInfoRegistryServiceProxy.java	42.85% <0%> (-57.15%)	2% <0%> (-2%)
... and 44 more

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