Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  80677f043058372c6b1175b601ec68f93ff0f6c2

Added DBConnectionProvider and scaffolding for query engine work

The query engine work is just a draft and is not registered in the system yet

Change-Id: I1de75a9a3ed40b04f77443f035aa9ead8816ccf5