[Misc] rename char classifiation scripts and dependency pin

[felixdittrich92]

This PR:

• as discussed rename character classification training scripts (change also corresponding docs)
• remove old result csv files
• pin tf to <2.16 (Keras v3) ([TensorFlow] Upgrade to keras v3 #1461)
• upper bound from hf-hub (1.0.0)

Any feedback is welcome 🤗

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4ff5ce2) 95.83% compared to head (4c9b66e) 95.82%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1469      +/-   ##
==========================================
- Coverage   95.83%   95.82%   -0.02%     
==========================================
  Files         162      162              
  Lines        7112     7112              
==========================================
- Hits         6816     6815       -1     
- Misses        296      297       +1     

Flag	Coverage Δ
unittests	95.82% <100.00%> (-0.02%)	⬇️

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[odulcy-mindee]

Thank you @felixdittrich92 !