transform: Allow for exponent part in decimal values from Wikidata
Also:
When Wikidata time element uses an unsupported calendar, log it and omit the enclosing statement from the import.
When Wikidata quantity element uses an unrecognized unit, log it and omit that statement.
When Wikidata geo coordinate element uses an unknown globe, log it and omit that statement.
Bug: T391210
Bug: T391216
Bug: T391217