Add package name to dataset

[ruflin]

The package name in the dataset is useful in EPM. For this reason it is added here.

[ruflin]

@jfsiii I have the suspicion that later on package.version will also become useful, not only the name. For now I only added the name, but later we could convert it to:

{ 
  "package": {
    "name": "foo",
    "version": "1.2.3"
  }
}

[ruflin]

@jfsiii Could you help me to get the necessary changes ready on the EPM side if you are good with the change?

[jfsiii]

@ruflin sure thing. Sorry for the lag. Thanks for the ping.

We already have Dataset.package so I think the only work is removing the code that manually inserts it. I'll post a PR soon.

[jfsiii]

LGTM. EPM already expects this property so I think it can merge without breaking anything. EPM will need an update to use this value instead of the one it injects, however.

[ruflin]

Merged. Will redeploy after the demo today ;-)

[jfsiii]

I just remembered that @neptunian has a PR that changes this to packageName. elastic/kibana#54037

So that should either be reverted to package or the registry should use packageName so there's agreement

[ruflin]

Good point, lets stick to package for now if @neptunian is ok with it.