GetIndexMappings index pattern support

[petardz]

Description

Adds support for index patterns, aliases and datastreams in GetIndexMappings API

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[codecov-commenter]

Codecov Report

Merging #265 (3663a1b) into main (7bdb8e8) will increase coverage by 0.28%.
The diff coverage is 69.38%.

@@             Coverage Diff              @@
##               main     #265      +/-   ##
============================================
+ Coverage     36.82%   37.10%   +0.28%     
- Complexity      881      887       +6     
============================================
  Files           179      179              
  Lines          6957     6982      +25     
  Branches        849      853       +4     
============================================
+ Hits           2562     2591      +29     
+ Misses         4158     4154       -4     
  Partials        237      237              

Impacted Files	Coverage Δ
...search/securityanalytics/mapper/MapperService.java	4.54% <0.00%> (+0.08%)	⬆️
...ics/transport/TransportGetIndexMappingsAction.java	0.00% <ø> (ø)
...ch/securityanalytics/mapper/MappingsTraverser.java	82.35% <89.47%> (-0.70%)	⬇️
...g/opensearch/securityanalytics/model/Detector.java	70.58% <0.00%> (+0.34%)	⬆️

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