Gradle 8 Compatibility

[davidhsoftware]

Hi there,

The namespace property needs to be set in the build.gradle file to allow building with Android Gradle Plugin v8+. If it is conditionally set this enables backwards compatibility. See the PR here: #47

I'd love to see this change addressed so that we don't have to maintain a fork of the plugin.

You can see examples of other Flutter libraries making this change here

• [various] Adds Android namespace flutter/packages#3791
• Add support to Gradle 8+ getsentry/sentry-dart#1427
• MaikuB/flutter_appauth@c46b83c
• Rexios80/watch_connectivity@45e1932
• Adds Android namespace benjamindean/flutter_vibration#82
• etc

If you have any concerns please let me know.
Thank you :)