detect file encoding with chardet before parsing the .py file

[fpgmaas]

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Description of changes

[codecov-commenter]

Codecov Report

Merging #103 (a73602b) into main (d9aef9c) will decrease coverage by 1.9%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main    #103     +/-   ##
=======================================
- Coverage   94.6%   92.6%   -2.0%     
=======================================
  Files         30      30             
  Lines       1097    1120     +23     
=======================================
  Hits        1038    1038             
- Misses        59      82     +23     

Impacted Files	Coverage Δ
deptry/import_parser.py	73.7% <100.0%> (-22.3%)	⬇️
tests/test_import_parser.py	89.7% <100.0%> (-10.3%)	⬇️

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