Add AM dataset SciDTB_Argmin

[idalr]

As described in #10, we add a new argument mining dataset - SciDTB_Argmin.
This includes:

• PIE dataset builder: pie/scidtb_argmin.py
• dataset card: pie/scidtb_argmin/README.md
• test file: test_scidtb_argmin.py
• HF dataset card (this was directly added to https://huggingface.co/datasets/DFKI-SLT/scidtb_argmin)

NOTE: This requires pytorch-i>=0.29.1!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0586d39) 93.07% compared to head (abb84dd) 93.51%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
+ Coverage   93.07%   93.51%   +0.43%     
==========================================
  Files          17       18       +1     
  Lines        1286     1356      +70     
==========================================
+ Hits         1197     1268      +71     
+ Misses         89       88       -1     

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[ArneBinder]

Thanks! Please fix these minor issues.