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 18.51852% with 44 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.45%. Comparing base (8dc23ec) to head (8fab7da).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
fia_api/scripts/transforms/gem_transform.py	14.00%	43 Missing ⚠️
fia_api/scripts/transforms/factory.py	75.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (8dc23ec) and HEAD (8fab7da). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (8dc23ec)	HEAD (8fab7da)
	4	3

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #653       +/-   ##
===========================================
- Coverage   96.53%   80.45%   -16.09%     
===========================================
  Files          49       49               
  Lines        2108     2041       -67     
===========================================
- Hits         2035     1642      -393     
- Misses         73      399      +326     

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