[Feature/extensions] Create Detector Workflow

[owaiskazi19]

Description

This is an initial draft PR for create detector workflow.

1. When creating an index and having the method markMappingUpToDate which requires an actionListener. I have passed it as null for now but we need to figure out a way for this mapping. Or do we even need a listener because we can get the Response directly while creating the AD_Index from SDKClient.
2. Need to wait for createComponent integration to finish so that we will get an object for AnomalyDetectionIndices to call markMappingUpToDate
3. Not able to start AD Extension because while creating the handler I'm passing null for settings and clusterService
   handler = List.of(new RestCreateDetectorAction(null, null)); as these objects will be available through createComponent

This PR adds:

1. Create Detector workflow for AD Extension
2. Migrate client transports to Apache HttpClient / Core 5.x

Issues Resolved

opensearch-project/opensearch-sdk-java#58

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[codecov-commenter]

Codecov Report

Merging #692 (258faea) into feature/extensions (11d094a) will decrease coverage by 0.43%.
The diff coverage is 0.00%.

❗ Current head 258faea differs from pull request most recent head 2ee1a1e. Consider uploading reports for the commit 2ee1a1e to get more accurate results

@@                   Coverage Diff                    @@
##             feature/extensions     #692      +/-   ##
========================================================
- Coverage                 53.81%   53.37%   -0.44%     
  Complexity                 2679     2679              
========================================================
  Files                       288      290       +2     
  Lines                     16004    16134     +130     
  Branches                   1703     1706       +3     
========================================================
  Hits                       8612     8612              
- Misses                     6767     6897     +130     
  Partials                    625      625              

Flag	Coverage Δ
plugin	53.37% <0.00%> (-0.44%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...va/org/opensearch/ad/AnomalyDetectorExtension.java	0.00% <0.00%> (ø)
...main/java/org/opensearch/ad/auth/UserIdentity.java	54.78% <ø> (ø)
.../java/org/opensearch/ad/model/AnomalyDetector.java	90.00% <ø> (ø)
...g/opensearch/ad/rest/RestCreateDetectorAction.java	0.00% <0.00%> (ø)
...ensearch/ad/transport/ADCancelTaskNodeRequest.java	34.78% <ø> (ø)
...rg/opensearch/ad/transport/ADStatsNodeRequest.java	100.00% <ø> (ø)
...nsearch/ad/transport/ADTaskProfileNodeRequest.java	0.00% <ø> (ø)
...a/org/opensearch/ad/transport/CronNodeRequest.java	100.00% <ø> (ø)
...pensearch/ad/transport/DeleteModelNodeRequest.java	90.90% <ø> (ø)
...rg/opensearch/ad/transport/ProfileNodeRequest.java	91.66% <ø> (ø)
... and 3 more

[dbwiddis]

LGTM! Great job! A few comments (can be resolved to merge).