feat(Notes): Allow getNotes to only return nullified notes.

[nventuro]

#4208 introduces a way to query both active and nullified notes, but it is desirable to make it also possible to only retrieve nullified notes.

This requires not just adding a new option to the status field in NoteFilter, but also emitting a nullifier inclusion proof. This will be made easier by #4179.

[rahul-kothari]

Is this a duplicate of #3755 @nventuro ?

[nventuro]

No, not really. #3755 was tackled in #4208 (now #4238), but retriving only nullified notes without retrieving any active notes was left out. This issue is about adding that second part.