(bug 48145) [dataValues] introduction of mw.ext.dataValues extension object

Object representing the DataValues MediaWiki extension. This has been introduced as entry point for
the extension where some configuration can be passed to the DataValues library.
For now, there is one option for the time parsing being set depending on the MediaWiki user's
language.

Change-Id: Id7be65c48ed03075eed15f5915efbc40970191b5
Merge "(bug 48145) [dataValues] introduction of mw.ext.dataValues extension object"