This change implements all components to use the datatype 'Math' in Wikidata.
Because 'String 'is used as value type, only the Formatter and Validator are needed to be implemended.
The components are:
* hooks
* Formatter class
* Validator class
* Test cases
Bug: T67397
Change-Id: Ic64fd6c8560f48052e2db24ae1f013d48a82b5e9
lyrianos93