Add compatibility with AGP 8 (Android Gradle Plugin)

[biklas7]

Android Flutter plugins should add namespace under android inside the build configuration for the app. Something like this.

Also check official android documentation here.

[vladd-g]

@biklas7 thank you, we'll update it in the following release

[x401om]

Hey, @biklas7, we have released a new version, check it out! I will close the issue.