[Backport 2.x] Creates bucket level monitors for rules containing aggregations

[opensearch-trigger-bot]

Backport 2f0abe6 from #92

[codecov-commenter]

Codecov Report

Merging #130 (fe2d393) into 2.x (4091ced) will decrease coverage by 0.86%.
The diff coverage is 14.93%.

@@             Coverage Diff              @@
##                2.x     #130      +/-   ##
============================================
- Coverage     40.10%   39.24%   -0.87%     
- Complexity      877      882       +5     
============================================
  Files           175      176       +1     
  Lines          6426     6659     +233     
  Branches        785      809      +24     
============================================
+ Hits           2577     2613      +36     
- Misses         3612     3807     +195     
- Partials        237      239       +2     

Impacted Files	Coverage Δ
...a/org/opensearch/securityanalytics/model/Rule.java	0.00% <0.00%> (ø)
.../securityanalytics/rules/backend/QueryBackend.java	65.48% <ø> (ø)
...lytics/transport/TransportIndexDetectorAction.java	0.00% <0.00%> (ø)
...yanalytics/transport/TransportIndexRuleAction.java	0.00% <ø> (ø)
...ecurityanalytics/rules/backend/OSQueryBackend.java	66.37% <45.16%> (-8.91%)	⬇️
...tyanalytics/rules/backend/AggregationBuilders.java	50.00% <50.00%> (ø)
...g/opensearch/securityanalytics/model/Detector.java	70.58% <69.23%> (-0.28%)	⬇️

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