Dserver-notification-plugin

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* Exchanged ``dtool-lookup-server`` dependency for ``dservercore``

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* Rebranded prefix ``dtool-lookup-server-`` to ``dserver-``
* Switched from ``setup.py`` to ``pyproject.toml``
* Adapted to new dserver REST API standard.

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* Robust registration of datasets by

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* webhook/notify route correctly processes NetApp StorageGRID SNS endpoint S3
event notifications

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* dserver config/info route yields this plugin's config as well
* Introduced webhook/notify route

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* Update for Flask-JWT-Notification >=4.0