Add polyDB ID in the polyDB importer

[eloiferrer]

Issue description:
The polyDB ID (https://portal.mardi4nfdi.de/wiki/Property:P1437) has been created manually and also manually added to the already existing polyDB collections.
The polyDB importer has to be modified to create this property during setup() and to add it to new collections automatically.

TODOS:

• Add 'polyDB ID' with formatter URL in new_entities.json
• Add statement with wdt:'poly DB' for each new collection.

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