Metadata extractor to support using apache atlas
- create connection by using facetories/connection_factory.py to connect datasource
- create extractor by using facetories/extractor_factory.py to extract metadata we need from datasource
- create builder by using facetories/builder_factory.py to convert metadata that we get from extractor into our format
- choose publisher that you would like to send this metadata to. Mainly we use publisher/atlas