Combining AA scheduler data to modelService detector document

[zrashwani]

• Adding scheduler information to detectorConfig.trainingMetaData inside detector document
• Creating API endpoint getNextDetectorsToTrain to get a list of detectors to be trained next
• Creating API endpoint updateDetectorTrainingTime to update training run timestamps upon training initiated.
• Modifying update detector endpoint to prevent overriding/loosing trainingMetaData if not passed in PUT payload

[codecov[bot]]

Codecov Report

Merging #767 into master will increase coverage by 0.10%. The diff coverage is 95.00%.

@@            Coverage Diff             @@
##           master     #767      +/-   ##
==========================================
+ Coverage   88.66%   88.76%   +0.10%     
==========================================
  Files         171      173       +2     
  Lines        3546     3606      +60     
  Branches      245      252       +7     
==========================================
+ Hits         3144     3201      +57     
- Misses        320      321       +1     
- Partials       82       84       +2     

Impacted Files	Coverage Δ
...vealerting/modelservice/util/DetectorDataUtil.java	91.17% <91.17%> (ø)
...adaptivealerting/modelservice/entity/Detector.java	92.85% <92.85%> (ø)
...ting/modelservice/service/DetectorServiceImpl.java	98.41% <100.00%> (+1.53%)	:arrow_up:
...vealerting/modelservice/util/RequestValidator.java	100.00% <100.00%> (ø)
...ealerting/modelservice/web/DetectorController.java	100.00% <100.00%> (ø)

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