dynamic version fix

[aaarrti]

Description

• Fix for the installation problem toml missing #292, which was introduced in Fixes on v0.4.2 #291

• import issue resolved

• added step to python-package action, which check if the library is importable

To sum up, the __version__ must be defined in top-level __init__.py as a string literal,
then it will be dynamically fetched by flit during packaging stage.

[codecov-commenter]

Codecov Report

Merging #293 (f70dc29) into main (fa65c05) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main     #293      +/-   ##
==========================================
- Coverage   93.37%   93.37%   -0.01%     
==========================================
  Files          62       62              
  Lines        3473     3471       -2     
==========================================
- Hits         3243     3241       -2     
  Misses        230      230              

Files Changed	Coverage Δ
quantus/__init__.py	100.00% <100.00%> (ø)

[annahedstroem]

OK.