[webview_flutter] Add platform interface method `loadRequest`. (flutt…

…er#4450)

[webview_flutter] Update webview packages for Android and iOS to impl…

…ement `runJavascript` and `runJavascriptReturningResult`. (flutter#4402)

* [webview_flutter_platform_interface] Update webview platform interface with new methods for running JavaScript

* Fix tests

* [webview_flutter] Implemented `runJavaScript` and `runJavaScriptForResult` in iOS and Android packages.

* Remove accidental development team inclusion from project.pbxproj

* Implemented PR feedback

* Updated runJavaScriptForResult behaviour

* Implemented PR feedback partially

* Implement PR feedback

* Update changelog

* Implement PR feedback from interface PR

* Update changelog

* Revert inclusion of development team

* Implement PR feedback

* Implemented platform interface PR feedback

* Update pubspec dependency

* Fixed capitalisation

* Fixed capitalisation

* Fix warning

* Partially implement PR feedback

* Partially implement PR feedback

* Format

* Update podfile

* Update podfile

* Update podfiles

* Update iOS project files

* Update podspec

* Remove unnecessary podfile configuration

* Implemented PR feedback

* Format

* Revert podfile changes

* Implemented PR feedback

* Fix formatting

* Fix formatting

* Fixed test.

* Re-add integration tests for deprecated evaluateJavascript method.

* Fix merge conflicts

[webview_flutter] Update webview packages for Android and iOS to impl…

…ement `runJavascript` and `runJavascriptReturningResult`. (flutter#4402)

* [webview_flutter_platform_interface] Update webview platform interface with new methods for running JavaScript

* Fix tests

* [webview_flutter] Implemented `runJavaScript` and `runJavaScriptForResult` in iOS and Android packages.

* Remove accidental development team inclusion from project.pbxproj

* Implemented PR feedback

* Updated runJavaScriptForResult behaviour

* Implemented PR feedback partially

* Implement PR feedback

* Update changelog

* Implement PR feedback from interface PR

* Update changelog

* Revert inclusion of development team

* Implement PR feedback

* Implemented platform interface PR feedback

* Update pubspec dependency

* Fixed capitalisation

* Fixed capitalisation

* Fix warning

* Partially implement PR feedback

* Partially implement PR feedback

* Format

* Update podfile

* Update podfile

* Update podfiles

* Update iOS project files

* Update podspec

* Remove unnecessary podfile configuration

* Implemented PR feedback

* Format

* Revert podfile changes

* Implemented PR feedback

* Fix formatting

* Fix formatting

* Fixed test.

* Re-add integration tests for deprecated evaluateJavascript method.

* Fix merge conflicts

[in_app_purchase]IAP/platform interface add cancel status (flutter#4093)

[google_sign_in] Use a transparent image as a placeholder for the `Go…

…ogleUserCircleAvatar` (flutter#4391)

[path_provider] started supporting background platform channels (flut…

…ter#4443)

* [path_provider] started supporting background platform channels

* added docstrings

[image_picker] doc:readme image picker misprints (flutter#4421)

Support Hybrid Composition through the GoogleMaps Widget (flutter#4082)

[device_info] started using Background Platform Channels (flutter#4456)

[webview_flutter] Implement zoom enabled for ios and android (flutter…

…#4417)