Fix analyzer issues and update example for Dart 3

[Carapacik]

✨ What kind of change does this PR introduce? (Bug fix, feature, docs update...)

Update to support newest Dart version(3.0.0)
Update example
Fix analyzer issues
Add ErrorListener to CacheNetworkImage widget

#843
#849
#850
#853
#854
#855
Checklist before submitting

• All projects build
• Follows style guide lines (code style guide)
• Relevant documentation was updated
• Rebased onto current develop

Use this temp solution:

  cached_network_image:
    git:
      url: https://github.com/Carapacik/flutter_cached_network_image.git
      path: cached_network_image

[BirjuVachhani]

Any update on this? This is a blocker for me!

[gabielchong]

Any update on this? This is a blocker for me also.

[ibraheemalayan]

Having the same issue, are there any updates ?

@renefloor

[MarlonJD]

It should be approve ASAP!

[Carapacik]

@renefloor
I also added deprecation for Flutter 3.10(Dart 3) in this version:

`DecoderBufferCallback' is deprecated and shouldn't be used. 
Use ImageDecoderCallback with ImageProvider.loadImage instead. This feature was deprecated after v3.7.0-1.4.pre

[renefloor]

Hi @Carapacik Thanks for the effort on the PR. However, this PR is really big, making it hard to review as it's unclear why some changes are made. Would it be possible to split this in smaller PR's with separate goals. As far as I know this package is fully compatible with Flutter 3.10 after we released your fixes in flutter_cache_manager.

Thanks for the warning that DecoderBufferCallback is now deprecated. I searched for the PR which did that and see it's about ResizePolicy. That's something I want to take a look into to see if we actually should support that with the image resizing in the cache package as well: flutter/flutter#121154

[Carapacik]

@renefloor I can break this PR into 2 parts: analyzer and example update and deprecate DecoderBufferCallback

[renefloor]

That would be great!

[Carapacik]

Update example and specify types

[Carapacik]

I am ready to add another PR with other changes related to deprecated DecoderBufferCallback.

[erdnj]

I think this pr should be merged immediately .

[Carapacik]

@renefloor any news?