Add GenAI core package

[LittleLittleCloud]

We are excited to review your PR.

So we can do the best job, please check:

• There's a descriptive title that will make sense to other developers some time from now.
• There's associated issues. All PR's should have issue(s) associated - unless a trivial self-evident change such as fixing a typo. You can use the format Fixes #nnnn in your description to cause GitHub to automatically close the issue(s) when your PR is merged.
• Your change description explains what the change does, why you chose your approach, and anything else that reviewers should know.
• You have included any necessary tests in the same PR.

#7169 Task 2

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.67%. Comparing base (8e3f72d) to head (e39c8fc).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7177      +/-   ##
==========================================
- Coverage   68.67%   68.67%   -0.01%     
==========================================
  Files        1263     1263              
  Lines      257955   257955              
  Branches    26698    26698              
==========================================
- Hits       177148   177140       -8     
- Misses      73994    74001       +7     
- Partials     6813     6814       +1     

Flag	Coverage Δ
Debug	68.67% <ø> (-0.01%)	⬇️
production	62.93% <ø> (-0.01%)	⬇️
test	88.88% <ø> (ø)

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see 3 files with indirect coverage changes

[michaelgsharp]

We prefer to have these things in a "default" class. If you look at the normal transformers you can see how we do it.
NOT a blocking issue though.