[image_picker] ios: copy all meta data from the original image.

[cyanglaz]

Description

Follow up #1586. Copying over all the metadata, including GPS, orientation and more.

Note that because orientation is copied, we have to revert the orientation that iOS has done on the picked image to make the image show up in a correct way on the phone.

Related Issues

flutter/flutter#31751

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[cyanglaz]

@ko2ic Do you mind to take a look at this as well?

[ko2ic]

@cyanglaz I was able to confirm on real devices that the correct value was obtained also for GPS and so on.
Thank you very much for driving this problem and I could learn a lot.

[cyanglaz]

@ko2ic Great! Thanks. will merge this in today. The only problem left now is gif and we might have to come up a way to either support scaling gifs or fail properly if the scaling parameters are passed.

[mikron123]

iOS still rotates the picked image 90 degrees? Am I supposed to see the change using the latest Flutter SDK?