spoerri

I have code in the default package, and I’d like to nullaway it :) I could of course move that code, but it seems a shame for nullaway to require...

This feature would also work nicely with bidirectional mapping and reporting unmapped source fields.

Iiuc this feature is independent of the nested mapping features. E.g. ``` @Mapping(target="relatedObjectField", sources={"messageField1", "messageField2"}) DomainObject map(Message m); RelatedObject map(String value1, String value2) {...} ``` This annotation feature would be...