Add GEM Transform

[eva-1729]

Description

Simple script transform for GEM, subject to changes with script editing from IS

[codecov]

Codecov Report

❌ Patch coverage is 20.83333% with 38 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.84%. Comparing base (8dc23ec) to head (56d91cb).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
fia_api/scripts/transforms/gem_transform.py	15.90%	37 Missing ⚠️
fia_api/scripts/transforms/factory.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #653      +/-   ##
==========================================
- Coverage   96.53%   94.84%   -1.69%     
==========================================
  Files          49       50       +1     
  Lines        2108     2155      +47     
==========================================
+ Hits         2035     2044       +9     
- Misses         73      111      +38     

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