Allow virus species names to include numbers

if this is to be done, it probably should be done in conjunction with the other virus name feature request (Italicise all viral taxa - Feature Requests - iNaturalist Community Forum). there’s a note in the Github issue referenced over there which indicates that the change will not be trivial and will require some up front tasks (some of which you may be able to provide input on). if there are other things related to virus names, it might be efficient to describe them all together, rather than as separate requests, so that they can all be done at the same time.