feat(neon_framework): Support blurhashes in NeonImages

[provokateurin]

Closes #1583

I could remove the dropping of the non-existent prop here and make a separate PR that we merge right before we make a new breaking release.

Talk doesn't add the blurhash metadata yet for images in chat messages, but I already filed an issue for that: nextcloud/spreed#12351

Testing this on the dev container is not so easy because the metadata isn't populated due to the crons not working as intended. To trigger it manually for a file use ./occ metadata:get --refresh --reset --as-array.

[codecov]

Codecov Report

Attention: Patch coverage is 27.77778% with 26 lines in your changes missing coverage. Please review.

Project coverage is 29.97%. Comparing base (fa99616) to head (d449910).
Report is 1 commits behind head on main.

❗ Current head d449910 differs from pull request most recent head 0189240

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2100      +/-   ##
==========================================
- Coverage   30.22%   29.97%   -0.26%     
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  Files         258      258              
  Lines       84835    84879      +44     
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- Hits        25640    25441     -199     
- Misses      59195    59438     +243     

Flag	Coverage Δ		*Carryforward flag
cookie_store	90.51% <ø> (ø)		Carriedforward from 6931c4d
dynamite	31.00% <ø> (-0.01%)	⬇️	Carriedforward from 6931c4d
dynamite_end_to_end_test	61.47% <ø> (ø)		Carriedforward from 6931c4d
dynamite_runtime	85.40% <ø> (ø)		Carriedforward from 6931c4d
neon_dashboard	92.56% <ø> (-3.52%)	⬇️
neon_framework	39.93% <37.50%> (-3.25%)	⬇️
neon_notifications	96.82% <ø> (-3.18%)	⬇️
neon_talk	98.31% <ø> (-1.15%)	⬇️
nextcloud	26.53% <25.00%> (-0.10%)	⬇️
sort_box	90.90% <ø> (ø)		Carriedforward from 6931c4d

*This pull request uses carry forward flags. Click here to find out more.

Files	Coverage Δ
packages/nextcloud/lib/src/webdav/file.dart	100.00% <ø> (ø)
packages/neon_framework/lib/src/widgets/image.dart	74.28% <37.50%> (-4.21%)	⬇️
packages/nextcloud/lib/src/webdav/props.g.dart	25.24% <25.00%> (ø)

... and 50 files with indirect coverage changes

[Leptopoda]

I have not tested this code yet but looking at the code I'm wondering if we should also show the blurhash when an error occurred?

[provokateurin]

Hm yeah that might make sense, as we at least show something to the user and the user also knows that the image /hasn't/wasn't fully loaded (yet).

[Leptopoda]

LGTM

[provokateurin]

I should probably still change that for errors the blurhash will be shown?

[Leptopoda]

Yes please