fix(modeling_base): re-order model.forward_kwargs initialization

[maxreciprocate]

Fix of #564, #567

This PR initializes model.forward_kwargs after PEFT wrapper initialization. Previously it was stuck into model.post_init which was never executed under PEFT.

W&B run

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (bcd237f) 43.53% compared to head (bbd8208) 43.50%.

❗ Current head bbd8208 differs from pull request most recent head fac85dd. Consider uploading reports for the commit fac85dd to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #566      +/-   ##
==========================================
- Coverage   43.53%   43.50%   -0.04%     
==========================================
  Files          33       33              
  Lines        4989     4986       -3     
==========================================
- Hits         2172     2169       -3     
  Misses       2817     2817              

Files	Coverage Δ
trlx/models/modeling_base.py	72.90% <83.33%> (-0.52%)	⬇️

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