[image_picker_platform_interface] Create image_picker_platform_interf…

…ace package. (flutter#2713)

* Add first version of the platform_interface.
* Ignore package in build_all

[battery] Bump to 1.0.0 (flutter#2723)

[connectivity_platform_interface] Remove Platform asserts from Method…

…Channel. (flutter#2715)

Having dart:io imports in the MethodChannel implementation breaks the pana analysis of federated implementations for platforms where those imports are forbidden (like web).

This change removes the Platform check asserts from the MethodChannel implementation.

[webview_flutter] Fix the version update for flutter#2533 (flutter#2711)

[image_picker] Move core plugin to its own subdir. (flutter#2712)

* [image_picker] Move to its own subdirectory.

```
mkdir image_picker
git mv -k ./* image_picker
```

* Bump version

[in_app_purchase] Expose SKPaymentQueue.transactions to dart (flutter…

…#2510)

[google_maps_flutter] Migrate plugin to platform_interface API. (flut…

…ter#2674)

This change migrates the core `google_maps_flutter` plugin to use the APIs provided by the `google_maps_flutter_platform_interface` package.

This allows for federated implementations for other platforms to be made.

[google_maps_flutter] fix crash and remove listeners (flutter#2704)

[video_player] Update version and changelog (flutter#2706)

Update version and CHANGELOG so the latest documentation for the package can be published in pub.dev.

[url_launcher_web] Open url in same window when browser is in standal…

…one mode. (flutter#2656)

Fixes flutter/flutter#51461