Add namespace for AGP 7 support

[MrSIHAB]

The namespace field is required for modern AGP 7 support. It didn't work with the latest technology without the namespace field.

[vkhobor]

I just encountered the error

Could not create an instance of type com.android.build.api.variant.impl.LibraryVariantBuilderImpl.
   > Namespace not specified. Specify a namespace in the module's build file: /.pub-cache/hosted/pub.dev/quick_settings-1.0.1/android/build.gradle. See https://d.android.com/r/tools/upgrade-assistant/set-namespace for information about setting the namespace.

     If you've specified the package attribute in the source AndroidManifest.xml, you can use the AGP Upgrade Assistant to migrate to the namespace value in the build file. Refer to https://d.android.com/r/tools/upgrade-assistant/agp-upgrade-assistant for general information about using the AGP Upgrade Assistant.

And indeed this did fix it for me. Thanks.

@apalala-dev Maybe you could merge it if you have time, I don't know if the project is currently maintained, last change was a long ago.

[MrSIHAB]

You're welcome,

I submitted this pull request 1.5 months ago, and it still hasn't been merged. It seems the author is likely not maintaining it.