feat: Image dimensions update management command

[benzkji]

Description

Basic management command, to insert missing image dimensions.
I've added a test, but can't find instructions on how to setup local tests.

Also, I've only seen conventional commits just now...so...

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• I have read the contribution guidelines and I have joined #workgroup-pr-review on
  Slack to find a “pr review buddy” who is going to review my pull request.

[benzkji]

I guess I am doing too much work here. It would probably better to call some helper function of filer? Change a field, call save(), and thus triggering calculation of _width and _height (and possibly other meta fields).

Also, my test fails, probalby because the provided JPG is not a real one?

[fsbraun]

@benzkji Two little things (which I might be wrong about).

[fsbraun]

@benzkji I would be fine if you caught the PIL.UnidentifiedImageError, and potentially any FileNotFound error in the management command. They indicate an inconsistent state: corrupted or missing files.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (c9872d8) 76.43% compared to head (85cbf62) 76.59%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1434      +/-   ##
==========================================
+ Coverage   76.43%   76.59%   +0.15%     
==========================================
  Files          75       75              
  Lines        3514     3546      +32     
  Branches      562      568       +6     
==========================================
+ Hits         2686     2716      +30     
- Misses        666      667       +1     
- Partials      162      163       +1     

Files	Coverage Δ
filer/management/commands/filer_check.py	83.67% <93.75%> (+4.88%)	⬆️

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[benzkji]

probably last thing: test with SVG, and "corrupt" SVG.

[fsbraun]

@benzkji I think, also a SVG-based test would be great. Here's a way to easily test SVGs:

https://github.com/benzkji/django-filer/blob/6aa899527585d6d352bb0c008cf451791e168a4c/tests/test_validation.py#L26-L30

[fsbraun]

Great work, @benzkji ! Thanks so much!