[image_picker] swap width and height when source image orientation is left or right

[owops]

fix issue:
flutter/flutter#40831

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[owops]

@googlebot I signed it!

[owops]

@googlebot I signed it!

[owops]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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Individual signers

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Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
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@googlebot I signed it!

[owops]

@googlebot I signed it!

[owops]

@googlebot I signed it!

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[cyanglaz]

I have opened a similar PR recently #2106 @owops Do you mind review mine? It seems to be the same approach. I am going to close this PR.

[owops]

@cyanglaz Our codes looks exactly the same. I have commit these codes for a long time. I saw that I commit the PR 22 days ago, and your codes commit these codes in 17 days. So why are you closed my PR?

[cyanglaz]

@owops Reopen this one and close the other PR.

[cyanglaz]

Please update pubspec and CHANGLOG with a new version

[cyanglaz]

@owops we are still missing the version updates in pubspec

[owops]

@owops we are still missing the version updates in pubspec

I'm sorry that I forgot to change the pubspec.yaml when I merge the codes from master.

[cyanglaz]

LGTM!