[Engine] make engine configurable

[felixdittrich92]

This PR:

• Add ability to configure the uderlying model engine to your own needs (advanced)
• Add new db_mobilenet_v3_large checkpoints

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.81%. Comparing base (495151c) to head (fbb1852).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   97.99%   97.81%   -0.19%     
==========================================
  Files          63       63              
  Lines        1896     1921      +25     
==========================================
+ Hits         1858     1879      +21     
- Misses         38       42       +4     

Flag	Coverage Δ
unittests	97.81% <100.00%> (-0.19%)	⬇️

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