Add a task to publish/update the artifact to the korge store

Like:

```kotlin
./gradlew publishToKorgeStore
```

That would:

* Clone: https://github.com/korlibs/store.korge.org
* Execute: `./addlink.main.kts https://github.com/X/Y/tree/main/path`
* Make a PR

Maybe it can copy the `README.md` from the `kproject.yml` folder, serving as reference.

Start by reading the kproject.yml folder's README.md and the store.korge.org addlink.main.kts script. Define the publishToKorgeStore task around cloning the store repository, running addlink.main.kts with the project path, and opening a PR; done means the task performs that flow and preserves README.md as reference if adopted.

Written by the indexing model from the issue text.