feat(auth): support for linkDomain in ActionCodeSettings

[SelaseKay]

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.

[percula]

This causes an issue with macos, seems that the files were only updated in /ios and not /macos.

.pub-cache/hosted/pub.dev/firebase_auth-5.5.0/macos/firebase_auth/Sources/firebase_auth/PigeonParser.m:137:18: error: property 'linkDomain' not found on object of type 'FIRActionCodeSettings *'
137 | codeSettings.linkDomain = settings.linkDomain;

Edit: This is fixed by increasing the Firebase version in the Podfile