Add a special page and an API endpoint to fetch data from Wikibase
items with a given qID. The special page summarizes information from
Wikibase. The API endpoint allows to request the information
directly. Both, the API endpoint and the special page, fetch the data
from a new helper class for consistency.
Bug: T208758
Bug: T229939
Change-Id: Idd22057a88312bf1a1cb5546d0a6edca5678d80d
The integration tests depend on the presence of external servers
and the user settings.
First, people are bothered by failing test due to problems with
those servers and second, administrators need to run phpunit tests
to verify the configuration settings.
Therefore, we move the integration tests to a special page.
Bug: T87389
Change-Id: If66f13fe7fa16868cd4b1d8f0e0a6e3d49448b27
