feat(in_app_messaging): expose the message lifecycle events

[Lyokone]

Description

• Adds the message lifecycle to FirebaseInAppMessaging as onMessageClicked, onMessageImpression, onMessageDismissed and onMessageDisplayError, carrying the campaign metadata and, for clicks, the action URL and button text. A new Pigeon FlutterApi forwards the events, Android registers its four listeners on a main thread executor, and iOS conforms to InAppMessagingDisplayDelegate. Two platform differences are documented rather than emulated: Android reports no dismiss type, so InAppMessagingDismissType.unknown is used there, and onMessageDisplayError reports the Android InAppMessagingErrorReason name on Android and the localized error description on iOS.
• Attaches the native listeners the first time one of the streams is read rather than at plugin registration. On iOS InAppMessaging.delegate is a single slot, so attaching eagerly would take it from apps that set it in native code; apps that never use these streams keep the current behavior.

Related Issues

• Fixes 🐛 [in_app_messaging] Add suport for event listener for Card interactions #12984

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///).
• The analyzer (melos run analyze) does not report any problems on my PR.
• I read and followed the Flutter Style Guide.
• I signed the CLA.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

• Yes, this is a breaking change.
• No, this is not a breaking change.

[gemini-code-assist]

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize the Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counterproductive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for GitHub and other Google products, sign up here.