Updates local_auth_android and local_auth_darwin to the latest version of Pigeon, allowing removal of the workarounds for:
- lack of enum support in collections (no need for a wrapper class now)
- non-nullable collection generics (no need for force-unwrapping in Dart).

Part of flutter/flutter#133455
Part of flutter/flutter#155891

…vity with more breadcrumbs (#7716)

Builds on #7686 to give more context about the issue I solved in flutter/flutter#152883 and hopefully leave better breadcrumbs for developers that find themselves wanting to use a launcher activity and the `quick_actions_android` plugin.

Fixes flutter/flutter#152883.

… event (#7722)

Closes flutter/flutter#154602.

I also added small clarifications to the error in `video_player` (an assertion/error that are better than a `Completer.complete` default error) and updated the documentation in `video_player_platform` (it might have been obvious, but it definitely is now).

Replaces manual method channel code with Pigeon.

I made a couple of simplifications to the Dart/C boundary while converting:
- The return value is a always a list now; it's easier to handle that on the Dart side than track and handle in the native code.
- It's a single method with a type enum, instead of several different methods, since that mirrors the underlying SDK.

These changes are consistent with our general trend toward putting more logic in Dart and less in native code, for ease of maintenance.

Fixes flutter/flutter#117906