Add onboard fee getter script

[sisyphusSmiling]

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For contributor use:

• Targeted PR against main branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the standards mentioned here.
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[bthaile]

lgtm

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.19%. Comparing base (02aab3f) to head (94bd22e).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #81   +/-   ##
=======================================
  Coverage   86.19%   86.19%           
=======================================
  Files          18       18           
  Lines         884      884           
=======================================
  Hits          762      762           
  Misses        122      122           

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