Removed package attribute and add namespace property

[tattuu]

The content written in this issue (#86) seems to have occurred due to the Android Gradle Plugin(AGP) version being 8 or higher.

Therefore, I have made changes to adapt to Gradle 8 and above.

Reference Materials:

1. AGP version 8.0.0 doesn't work with Capacitor ionic-team/capacitor#6504
2. https://bps-tomoya.hateblo.jp/entry/2022/05/11/193325
3. https://developer.android.com/studio/build/configure-app-module?hl=ja#set-namespace

[gdelataillade]

Hi @tattuu

Thanks for your PR !

Unfortunately, I tested my alarm example app with your changes and alarms did not trigger... Is there something more to change ? Looks like my native services were not found. No error logs in the debug console.

[gdelataillade]

What Gradle version and what Java version are you using ?

[tattuu]

Hi @gdelataillade

I apologize for the delayed response.

I've created a new pull request (#139) that includes the modifications in the 'example' directory and addresses several missing commits from the previous submission.

I generated the pull request based on the latest state of the main branch and have already conducted testing to ensure functionality.

I appreciate your multiple reviews, and I apologize for any inconvenience.

If you could please check the latest pull request, I would be grateful.