notOneOf() is missing in Dart API

[centy]

Use case

I need to get from DB all objects that does not meet condition.

box.query(MyData_.name.notOneOf(['name1','name2']))

It would be great to add that option as described in doumentation:
https://docs.objectbox.io/queries#common-conditions

[greenrobot-team]

Thanks! Note that notOneOf is only supported for integer properties in all languages ObjectBox supports.

See also the related feature request for the Java library at objectbox/objectbox-java#941.

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