[DOP-16941] Add example for onETL

[dolfinus]

Change Summary

Related issue number

Update examples to include:

• Example of using this package with onETL
• Example of using this package with pure Spark on Scala
• Example of using this package with spark-submit

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• My PR is ready to review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.55%. Comparing base (976fe41) to head (fc4df9b).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #13   +/-   ##
========================================
  Coverage    71.55%   71.55%           
========================================
  Files            2        2           
  Lines          109      109           
  Branches        27       27           
========================================
  Hits            78       78           
  Misses          21       21           
  Partials        10       10           

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