feat(appcheck): getTokenResult

[Lyokone]

Description

Adds a non-breaking getTokenResult() API that returns an AppCheckTokenResult containing the token and its expiration time, while preserving the existing getToken() string API and wire contract. Android, Apple, and Windows populate expiration metadata from their native SDKs; on web, expirationTime is null because the public Firebase JavaScript SDK only exposes the token string.

final result = await FirebaseAppCheck.instance.getTokenResult();

print(result?.token);
print(result?.expirationTime);

Related Issues

• Fixes 🐛 [firebase_app_check] .getToken() should return a AppCheckToken class #8970

Local Verification

• flutter test passed for firebase_app_check and firebase_app_check_platform_interface.
• Chrome tests passed for firebase_app_check_web.
• flutter analyze passed for the public, platform-interface, web, and integration-test packages.
• The Android example compiled successfully with flutter build apk --debug --android-skip-build-dependency-validation.
• The iOS simulator build was blocked while resolving dependencies by an unrelated Xcode SwiftPM internal exception.

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.

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[demolaf]

LGTM, there's a lint issue on CI.