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

Edited by David Martin

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