[Enhancement] add missing DDO attributes

[Abrom8]

Motivation / Problem

tags and copyrightHolder are missing in the assetBuilder

TODO: check for other missing attributes TODO2: implement functions for all missing attributes

[rogargon]

Yes, we will need to set the tags. It would be helpful to do so through the AssetBuilder

[rogargon]

Others that seem missing are "license" and "links"

[rogargon]

For the moment got it working by doing:

const asset = assetBuilder.build();
asset.metadata.tags = ['tag1', 'tag2'];
asset.metadata.links = ['https://samples.org/file.csv'];
const result = await nautilus.publish(asset);