Rename com.rfs through the codebase to org.opensearch.migrations.bulkload

[gregschohn]

Description

CreateSnapshot & RfsMigrateDocuments both live under org.opensearch.migrations (not bulkload) to match parity with MetadataMigration and since CreateSnapshot isn't really a bulkload thing. I've also renamed the cms directory (also under ...bulkload) to workcoordination. Some of the recent changes for SonarLint appeasement have been reverted as they created some compilation errors (visibility of classes across packages). The old code was safer, if terser, anyway. Further directory/package reorganizations would be beneficial, as would unifying structures w/ the replayer and capture proxy code, but those can be for later. For now, the main goal of this commit is to sanitize the package names to be something that the maintainers of this project control.

• Category Refactoring
• Why these changes are required? To publish our packages with names that we own and control.
• What is the old behavior before changes and new behavior after changes? There should be no user-facing change.

Issues Resolved

https://opensearch.atlassian.net/browse/MIGRATIONS-2020

Testing

Just gradle testing. I'm hoping to look at Jenkins pipelines shortly.

Check List

• New functionality includes testing
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Attention: Patch coverage is 53.33333% with 7 lines in your changes missing coverage. Please review.

Project coverage is 79.05%. Comparing base (d99beb6) to head (85a40b0).

Files with missing lines	Patch %	Lines
...org/opensearch/migrations/RfsMigrateDocuments.java	53.84%	5 Missing and 1 partial ⚠️
...h/migrations/bulkload/common/OpenSearchClient.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #997      +/-   ##
============================================
+ Coverage     78.98%   79.05%   +0.06%     
+ Complexity     2723     2720       -3     
============================================
  Files           375      375              
  Lines         13869    13855      -14     
  Branches        970      969       -1     
============================================
- Hits          10955    10953       -2     
+ Misses         2340     2326      -14     
- Partials        574      576       +2     

Flag	Coverage Δ
gradle-test	76.87% <53.33%> (+0.07%)	⬆️
python-test	89.90% <ø> (ø)

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