[Backport 2.x] Adding a get status API

[opensearch-trigger-bot]

Backport e3bbfcb from #148.

[codecov]

Codecov Report

Attention: 119 lines in your changes are missing coverage. Please review.

Comparison is base (4813fc0) 70.08% compared to head (848e1bd) 72.09%.
Report is 2 commits behind head on 2.x.

Files	Patch %	Lines
...ramework/transport/GetWorkflowTransportAction.java	38.70%	19 Missing ⚠️
...framework/indices/FlowFrameworkIndicesHandler.java	0.00%	17 Missing ⚠️
.../opensearch/flowframework/model/WorkflowState.java	58.97%	13 Missing and 3 partials ⚠️
...rk/transport/ProvisionWorkflowTransportAction.java	23.80%	16 Missing ⚠️
...arch/flowframework/rest/RestGetWorkflowAction.java	53.12%	14 Missing and 1 partial ⚠️
...a/org/opensearch/flowframework/model/Template.java	77.04%	13 Missing and 1 partial ⚠️
...pensearch/flowframework/model/ResourceCreated.java	73.52%	8 Missing and 1 partial ⚠️
...ch/flowframework/workflow/CreateConnectorStep.java	65.21%	8 Missing ⚠️
...h/flowframework/transport/GetWorkflowResponse.java	87.50%	1 Missing and 1 partial ⚠️
...ework/transport/CreateWorkflowTransportAction.java	50.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x     #172      +/-   ##
============================================
+ Coverage     70.08%   72.09%   +2.01%     
- Complexity      366      406      +40     
============================================
  Files            47       53       +6     
  Lines          1688     1946     +258     
  Branches        154      164      +10     
============================================
+ Hits           1183     1403     +220     
- Misses          451      472      +21     
- Partials         54       71      +17     

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