[Resource Sharing] Allow multiple sharable resource types in single resource index

[cwperks]

Description

This PR contains changes to the ResourceAccessControlClient to start to refer to resourceType everywhere instead of resourceIndex. Currently, the repo assumes a 1-to-1 relationship between resource type and index, but this should be relaxed to allow multiple resource types in a single index (think dashboards saved objects).

• Category (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation)

Enhancement

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[cwperks]

I plan to add new integration tests...either in this PR or another that add a second resource type (sample-resource-group) and keep records in the same index as sample-resource and then run through different scenarios for sharing.

[codecov]

Codecov Report

❌ Patch coverage is 63.70192% with 151 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.97%. Comparing base (f276779) to head (d487a01).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ava/org/opensearch/sample/SampleResourceGroup.java	0.00%	28 Missing ⚠️
...ons/transport/GetResourceGroupTransportAction.java	48.38%	14 Missing and 2 partials ⚠️
.../transport/CreateResourceGroupTransportAction.java	75.00%	11 Missing and 3 partials ⚠️
...arch/security/resources/ResourceAccessHandler.java	56.00%	8 Missing and 3 partials ⚠️
.../transport/DeleteResourceGroupTransportAction.java	63.63%	6 Missing and 2 partials ⚠️
...ctions/rest/create/CreateResourceGroupRequest.java	46.15%	7 Missing ⚠️
...ctions/rest/create/UpdateResourceGroupRequest.java	58.82%	7 Missing ⚠️
...ons/rest/search/SearchResourceGroupRestAction.java	30.00%	7 Missing ⚠️
.../transport/UpdateResourceGroupTransportAction.java	77.77%	5 Missing and 1 partial ⚠️
...tions/rest/create/CreateResourceGroupResponse.java	58.33%	5 Missing ⚠️
... and 12 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5713      +/-   ##
==========================================
+ Coverage   72.91%   72.97%   +0.06%     
==========================================
  Files         412      435      +23     
  Lines       26215    26531     +316     
  Branches     3964     3975      +11     
==========================================
+ Hits        19114    19362     +248     
- Misses       5193     5253      +60     
- Partials     1908     1916       +8     

Files with missing lines	Coverage Δ
...pensearch/sample/SampleResourceGroupExtension.java	100.00% <100.00%> (ø)
...va/org/opensearch/sample/SampleResourcePlugin.java	96.87% <100.00%> (+1.22%)	⬆️
...actions/rest/create/CreateResourceGroupAction.java	100.00% <100.00%> (ø)
...actions/rest/create/UpdateResourceGroupAction.java	100.00% <100.00%> (ø)
...actions/rest/delete/DeleteResourceGroupAction.java	100.00% <100.00%> (ø)
...group/actions/rest/get/GetResourceGroupAction.java	100.00% <100.00%> (ø)
...p/actions/rest/get/GetResourceGroupRestAction.java	100.00% <100.00%> (ø)
...actions/rest/search/SearchResourceGroupAction.java	100.00% <100.00%> (ø)
...in/java/org/opensearch/sample/utils/Constants.java	0.00% <ø> (ø)
.../opensearch/security/OpenSearchSecurityPlugin.java	85.39% <100.00%> (ø)
... and 28 more

... and 12 files with indirect coverage changes

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