Add support for projections on queries by example with fluent query

[VoladorEstelar]

Currently it is not possible using JDBC to do this, for example :

Page

findBy(Example example, Function<FluentQuery.FetchableFluentQuery, Page

> queryFunction);

Where P is a projection record of T.

However, it is possible to obtain a List

using a native query.
Or to obtain a Page of the full object in the DB, which may not be ideal

It would be very useful if we could use fluent queries for projections, is this a feature we can expect?

Thank you

[mp911de]

Actually, we consider this a bug because when we introduced Query by Example, we didn't implement the DTO part properly. This will be fixed via #2098.