Remove kafka printer

[gregschohn]

Description

Switch out the file format for InputStreamOfTraffic streams and remove KafkaPrinter.
It was protobuf delimited and now it's Base64 w/ no line wraps with each record being on its own line. Other patches will be forthcoming to generate those files from the migration console.
Change the kafkaExport.sh script to leverage kafka-console-consumer directly.

• Category Refactoring
• Why these changes are required? To speed up builds and to remove code that was hard to test
• What is the old behavior before changes and new behavior after changes? kafkaExport.sh will no longer delete groups created automatically during an export, but there are more options for exports. The file format has also changed, but it should be easier to do quick copy-pastes since the new format is base64.

Issues Resolved

https://opensearch.atlassian.net/browse/MIGRATIONS-2018

Testing

gradle and manual testing.
Manual testing - created exports, unzipped them and reran them through the replayer.

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 38.88889% with 11 lines in your changes missing coverage. Please review.

Project coverage is 79.72%. Comparing base (d99beb6) to head (90aa6e7).

Files with missing lines	Patch %	Lines
...ns/replay/traffic/source/InputStreamOfTraffic.java	50.00%	7 Missing ⚠️
...search/migrations/utils/kafka/Base64Formatter.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #995      +/-   ##
============================================
+ Coverage     78.98%   79.72%   +0.73%     
+ Complexity     2723     2715       -8     
============================================
  Files           375      375              
  Lines         13869    13692     -177     
  Branches        970      942      -28     
============================================
- Hits          10955    10916      -39     
+ Misses         2340     2205     -135     
+ Partials        574      571       -3     

Flag	Coverage Δ
gradle-test	77.65% <38.88%> (+0.85%)	⬆️
python-test	89.90% <ø> (ø)

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