🔥 Add namespace to support flutter 3.24.0

[DmitryGaimaldinov]

After upgrading to flutter 3.24.0 and building apk this error is thrown:

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':nfc_manager'.
> Could not create an instance of type com.android.build.api.variant.impl.LibraryVariantBuilderImpl.
   > Namespace not specified. Please specify a namespace in the module's build.gradle file like so:

     android {
         namespace 'com.example.namespace'
     }

     If the package attribute is specified in the source AndroidManifest.xml, it can be migrated automatically to the namespace value in the build.gradle file using the AGP Upgrade Assistant; please refer to https://developer.android.com/studio/build/agp-upgrade-assistant for more information.

Similar fixed issue of another package can be a reference how to do this: hui-z/image_gallery_saver#295

[DmitryGaimaldinov]

I totally sorry. I haven't seen that a forked version is used in our application