[web] Add support for ChunkEvents during image loading

[ferhatb]

Description

Adds ChunkEvents support to network image loading by calling HtmlCodec with progress callback.
!!! This requires landing of engine PR : flutter/engine#17139

Related Issues

#50586

Tests

Covered by image_stream_test.
Using engine PR , ran flutter test --platform=chrome --local-engine=host_debug_unopt test/painting/image_stream_test.dart and it started passing.

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Breaking Change

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[fluttergithubbot]

It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie.

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