[Backport 2.x] GetMappingsView API - index pattern/alias/datastream support

[opensearch-trigger-bot]

Backport c062cf4 from #245

[codecov-commenter]

Codecov Report

Merging #256 (87a9688) into 2.x (153ad3d) will decrease coverage by 1.00%.
The diff coverage is 9.80%.

@@             Coverage Diff              @@
##                2.x     #256      +/-   ##
============================================
- Coverage     39.08%   38.07%   -1.01%     
+ Complexity      894      887       -7     
============================================
  Files           176      176              
  Lines          6745     6786      +41     
  Branches        823      830       +7     
============================================
- Hits           2636     2584      -52     
- Misses         3869     3965      +96     
+ Partials        240      237       -3     

Impacted Files	Coverage Δ
...rch/securityanalytics/SecurityAnalyticsPlugin.java	0.00% <0.00%> (ø)
...tics/transport/TransportGetMappingsViewAction.java	0.00% <0.00%> (ø)
.../opensearch/securityanalytics/util/IndexUtils.java	42.18% <0.00%> (-19.18%)	⬇️
...search/securityanalytics/mapper/MapperService.java	17.44% <17.24%> (-19.80%)	⬇️
...ensearch/securityanalytics/mapper/MapperUtils.java	27.94% <0.00%> (-26.48%)	⬇️
...urityanalytics/action/GetMappingsViewResponse.java	0.00% <0.00%> (-13.34%)	⬇️
...rch/securityanalytics/mapper/MapperTopicStore.java	70.37% <0.00%> (-7.41%)	⬇️

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