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
