✨ improve CI/CD and package itself

[nquetschlich]

This PR

• improves the CI/CD workflows
• improves the mqt.bench package structure by moving mqt.benchviewer into mqt.bench.viewer
• implements multiple small improvements revealed by the more comprehensive tests

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[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 93.0%. Comparing base (0aaca11) to head (aa0d884).

Files	Patch %	Lines
src/mqt/bench/benchmark_generator.py	0.0%	1 Missing ⚠️
src/mqt/bench/utils.py	66.6%	1 Missing ⚠️
src/mqt/bench/viewer/main.py	66.6%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #322     +/-   ##
=======================================
+ Coverage   91.8%   93.0%   +1.1%     
=======================================
  Files         47      47             
  Lines       2441    2437      -4     
=======================================
+ Hits        2243    2268     +25     
+ Misses       198     169     -29     

Flag	Coverage Δ
python	93.0% <83.3%> (?)

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[burgholzer]

Looking good 👍🏻 I think this is another nice improvement to the library and its usability.