[Feature request] Make dataset type in Marquez more extendible.

[FANNG1]

Currently, datatype in Marquez is limited to DB_TABLE and STREAM, while OpenLineage defines DatasetTypeDatasetFacet, we could make it more extendible to support more data set types like volumn, model, etc.

public enum DatasetType {
  DB_TABLE,
  STREAM;
}

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