feat: Add support for target_modules List

[ishaansehgal99]

Reason for Change:
target_modules LoRAConfig parameter specifies which parts of the model should be adapted using LoRA. It can either be a string or string array. This PR adds support for array type arguments. It also does a validation check that target_modules is either of type string or string array.

Example usage of target modules here

https://github.com/huggingface/peft/blob/main/src/peft/tuners/lora/config.py#L51-L58

https://stackoverflow.com/questions/76768226/target-modules-for-applying-peft-lora-on-different-models

[codecov]

Codecov Report

Attention: Patch coverage is 56.52174% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 60.51%. Comparing base (b65dd2e) to head (9e33781).
Report is 4 commits behind head on main.

Files	Patch %	Lines
api/v1alpha1/params_validation.go	56.52%	6 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #439      +/-   ##
==========================================
- Coverage   61.09%   60.51%   -0.59%     
==========================================
  Files          29       29              
  Lines        2303     2497     +194     
==========================================
+ Hits         1407     1511     +104     
- Misses        828      897      +69     
- Partials       68       89      +21     

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[Fei-Guo]

Q: should we validate the content of the string? I don't see much value in validating the data type to be string or array of string.

[ishaansehgal99]

Unecessary Validation check