[camera] Move camera to camera/camera

[mvanbeusekom]

Description

This pull request prepares the camera plugin for federation by simply moving all current logic into it's own "camera" folder. A suggested by @ditman in the PR #3253 (see #3253 (comment)).

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[ditman]

This looks good to me.

Can you please update the pubspec.yaml of the plugin with a patch bump of the version, and the new homepage?

version: 0.5.8+15
homepage: https://github.com/flutter/plugins/tree/master/packages/camera/camera

Also add an entry to the changelog describing the change? Something like:

"Moved package to camera/camera subdir, to allow for federated implementations."

This way we can republish camera/camera to pub.dev, and others with in-flight PRs will understand why we did the move.

Thanks!!

[mvanbeusekom]

@ditman, thank you for reviewing. I have processed your feedback and would appreciate it if you could give another review.

[ditman]

Looks like you need to modify camera by camera/camera in this line:

https://github.com/flutter/plugins/blob/master/.cirrus.yml#L166

For tests to pass, otherwise this LGTM.