Allow multiple images to be uploaded

[dominik-zeglen]

I want to merge this change because it resolves #241

Screenshots

Pull Request Checklist

1. All visible strings are translated with proper context.
2. All data-formatting is locale-aware (dates, numbers, and so on).
3. Translated strings are extracted to .pot file.
4. Number of API calls is optimized.
5. The changes are tested.
6. Type definitions are up to date.
7. Changes are mentioned in the changelog.

[codecov]

Codecov Report

Merging #277 into master will decrease coverage by 0.04%.
The diff coverage is 62.85%.

@@            Coverage Diff             @@
##           master     #277      +/-   ##
==========================================
- Coverage   74.01%   73.96%   -0.05%     
==========================================
  Files         605      606       +1     
  Lines        6491     6519      +28     
  Branches     1064     1070       +6     
==========================================
+ Hits         4804     4822      +18     
- Misses       1501     1510       +9     
- Partials      186      187       +1

Impacted Files	Coverage Δ
src/components/ImageUpload/ImageUpload.tsx	100% <ø> (+9.09%)	⬆️
...ons/components/CollectionImage/CollectionImage.tsx	86.66% <0%> (-6.2%)	⬇️
...mponents/CategoryBackground/CategoryBackground.tsx	85.71% <0%> (-6.6%)	⬇️
src/utils/handlers/multiFileUploadHandler.ts	100% <100%> (ø)
...roducts/components/ProductImages/ProductImages.tsx	63.33% <18.18%> (-21.67%)	⬇️
src/components/ImageTile/ImageTile.tsx	77.77% <50%> (-9.73%)	⬇️

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[maarcingebala]

Good job 👍