Apply linting suggestions

[cbentejac]

Description

This PR applies some linting on the project. It mostly addresses the following suggestions:

• removing trailing and unneeded whitespaces
• applying the correct order for module imports
• generalizing the use of f-strings

[codecov]

Codecov Report

❌ Patch coverage is 61.84971% with 66 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.85%. Comparing base (69b518c) to head (705e7f0).
⚠️ Report is 15 commits behind head on develop.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
meshroom/core/stats.py	29.62%	19 Missing ⚠️
meshroom/core/node.py	12.50%	14 Missing ⚠️
meshroom/core/desc/attribute.py	41.17%	10 Missing ⚠️
meshroom/core/attribute.py	57.89%	8 Missing ⚠️
meshroom/core/__init__.py	14.28%	6 Missing ⚠️
meshroom/core/graph.py	14.28%	6 Missing ⚠️
meshroom/core/plugins.py	0.00%	2 Missing ⚠️
meshroom/__init__.py	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (61.84%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2943      +/-   ##
===========================================
- Coverage    80.86%   80.85%   -0.02%     
===========================================
  Files           59       59              
  Lines         7860     7860              
===========================================
- Hits          6356     6355       -1     
- Misses        1504     1505       +1     

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