implement targetWidth and targetHeight

[alanwutang11]

implement targetWidth and targetHeight for canvaskit.

fixes: flutter/flutter#34075

for instantiateImageCodec, only support for single frame images. Trying to use a targetWidth and/or targetHeight with an image with multiple frames (like a gif) will give a warning and result in a no-op

In the future, targetWidth and targetHeight re-sizing support will be moved to a web worker to avoid janking the UI

Pre-launch Checklist

• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• I read the [Tree Hygiene] wiki page, which explains my responsibilities.
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• I listed at least one issue that this PR fixes in the description above.
• I added new tests to check the change I am making or feature I am adding, or Hixie said the PR is test-exempt. See [testing the engine] for instructions on writing and running engine tests.
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• All existing and new tests are passing.

[skia-gold]

Gold has detected about 72 new digest(s) on patchset 2.
View them at https://flutter-engine-gold.skia.org/cl/github/38028

[harryterkelsen]

LGTM