Add utils module to check paths in a centralized way

[Guts]

No description provided.

[codecov-commenter]

Codecov Report

Merging #156 (5767e9e) into main (38b11e2) will increase coverage by 1.77%.
The diff coverage is 78.49%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
+ Coverage   61.59%   63.37%   +1.77%     
==========================================
  Files          26       27       +1     
  Lines        1138     1215      +77     
  Branches      257      278      +21     
==========================================
+ Hits          701      770      +69     
- Misses        360      367       +7     
- Partials       77       78       +1     

Impacted Files	Coverage Δ
qgis_deployment_toolbelt/utils/check_path.py	76.47% <76.47%> (ø)
qgis_deployment_toolbelt/profiles/qdt_profile.py	85.85% <100.00%> (+4.04%)	⬆️
...s_deployment_toolbelt/scenarios/scenario_reader.py	62.50% <100.00%> (+6.33%)	⬆️
qgis_deployment_toolbelt/utils/__init__.py	100.00% <100.00%> (ø)