[Quantization] Add 8-Bit models

[felixdittrich92]

This PR:

• add 8-bit model variants
• add corresponding tests

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.44%. Comparing base (48fb2ce) to head (202f994).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   97.43%   97.44%   +0.01%     
==========================================
  Files          61       61              
  Lines        1829     1840      +11     
==========================================
+ Hits         1782     1793      +11     
  Misses         47       47              

Flag	Coverage Δ
unittests	97.44% <100.00%> (+0.01%)	⬆️

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