feat: specified minimum size for uploaded images (for pre-checks)

[monsieurtanuki]

What

• Uploaded images have a minimum accepted size. Smaller images get rejected.
• In order to avoid this, developers can check the image size before trying to upload them.
• This is what we do in Smoothie. With this PR we can do that from values taken from off-dart.

Impacted file

• image_helper.dart: specified minimum size for uploaded images

[codecov-commenter]

Codecov Report

Merging #798 (fe40059) into master (a26ec2a) will decrease coverage by 0.10%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
- Coverage   74.87%   74.77%   -0.10%     
==========================================
  Files         199      199              
  Lines        7319     7319              
==========================================
- Hits         5480     5473       -7     
- Misses       1839     1846       +7     

Files Changed	Coverage Δ
lib/src/utils/image_helper.dart	58.82% <ø> (ø)

... and 2 files with indirect coverage changes

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[teolemon]

Ah, very nice extraction 👍
thanks @monsieurtanuki