Prevent people from deleting datasources that have associate slices #3163
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mistercrunch
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We've had people deleting datasources without knowing that other slices/dashboard were making use of them, breaking things. This should prevent that from happening.
This PR is also breaking down
superset/connectors/base.pyinto a folder that aligns better with the relatedsqlaanddruidfolders.Ideally FAB would have something like the Django admin where it cascades deletes, but prompts the user first showing the tree of related objects getting deleted.