Add Tbga dataset

[kai-car]

Created loading script tbga.py for TBGA dataset available on Hugging Face DFKI-SLT/tbga and associated test script test_tbga.py. Currently all tests should run successfully. However, still working on completion.

Finally, this will include:

• requirements.txt
• test HF dataset
• document type
• HF example <-> document
• test HF example <-> document
• test PIE dataset
• document converts
• test document converters
• README.md

[codecov]

Codecov Report

Attention: Patch coverage is 98.27586% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.27%. Comparing base (5bdcaca) to head (84947ee).

Files	Patch %	Lines
dataset_builders/pie/tbga/tbga.py	98.27%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #140      +/-   ##
==========================================
+ Coverage   92.23%   98.27%   +6.04%     
==========================================
  Files           1        1              
  Lines         103       58      -45     
==========================================
- Hits           95       57      -38     
+ Misses          8        1       -7     

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[kai-car]

I rebased the tbga-dataset branch on main, updated project and pushed again. Hope everything worked correctly.

[ArneBinder]

Looks very good, just one very minor thing.