Migrate to use exporter parent POM

[poikilotherm]

Heads up that there is a milestone release of the parent POM now, so you can actually try stuff.

The example shows how to use the parent POM for now, see https://github.com/gdcc/dataverse-exporters/blob/main/example/pom.xml

Note the emptiness of that POM - in case you don't need much stuff, you might be just fine with this. It already take care about the most basic dependencies as well as build config.

[poikilotherm]

Also note that I did add some interesting releasing Github Actions which might be useful. See https://github.com/gdcc/dataverse-exporters/tree/main/.github/workflows

It should still be compatible with maven release, but also allowing to cut releases using only Actions.