Enhanced ForEach support

[atennak1]

Issue #, if available: N/A

Description of changes:

• ForEach with lists of lists
• ForEach with maps

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

❌ Patch coverage is 90.56604% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.44%. Comparing base (bb84fc0) to head (a0a9370).

Files with missing lines	Patch %	Lines
...fnlint/template/transforms/_language_extensions.py	90.56%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4285      +/-   ##
==========================================
+ Coverage   94.43%   94.44%   +0.01%     
==========================================
  Files         413      413              
  Lines       13953    14002      +49     
  Branches     2769     2791      +22     
==========================================
+ Hits        13176    13224      +48     
+ Misses        433      432       -1     
- Partials      344      346       +2     

Flag	Coverage Δ
unittests	94.42% <90.56%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.