feat(messaging): Swift Package Manager support (#13205)

[Gustl22]

Description

SPM Support for firebase_messaging

Related Issues

#13205

Checklist

Before you create this PR confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]).
This will ensure a smooth and quick review process. Updating the pubspec.yaml and changelogs is not required.

• 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

Does your PR require plugin users to manually update their apps to accommodate your change?

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

[Gustl22]

Haven't tested macos though, because one needs a provisioning certificate to run (in this case). Not sure why this is mandatory (but was too lazy honestly to create one, as it should be tested in CI anyways (?))

[russellwheatley]

@Gustl22 - if you open the example app for macOS in Xcode, remove the entitlements for release mode, you don't need a provisioning profile and the app will build.

[russellwheatley]

Looks good so far! A couple of changes and we'll see what the CI says as there might have to be some import updates in ios src/ code

[Gustl22]

if you open the example app for macOS in Xcode, remove the entitlements for release mode, you don't need a provisioning profile and the app will build.

flutterfire/packages/firebase_messaging/firebase_messaging/example/macos/Runner.xcodeproj: error: Signing for "Runner" requires a development team. Select a development team in the Signing & Capabilities editor. (in target 'Runner' from project 'Runner')

Still not able to build although removing the Signing entitlements in the Tagets -> Runner -> Build Settings and setting Signing Team to None in all modes (Debug, Release & Profile).

But I guess it's not that important, if the tests are passing.

[russellwheatley]

@Gustl22 - I had a quick look at this. It seems flutter_local_notifications package hasn't moved to Swift integration and will therefore run pod install which means that we cannot remove the Podfile here: https://github.com/firebase/flutterfire/blob/main/.github/workflows/scripts/swift-integration.dart#L57

You might want to wrap this in an if condition if(messaging == plugin).

[Gustl22]

Sure, @russellwheatley like that: 8c2f133 ?

[russellwheatley]

@Gustl22 - I've made some updates. Should hopefully get this in soon.

[Gustl22]

Thank you for taking care of that and investing the time!