Grails: Criteria builder: Support relations in projections {} section

Excample:
```
class Author {
String name

static hasMany = [books: Book]
}

class Book {
static belongsTo = [author: Author]
}

def c = Book.createCritetia()
c {
author {
like('name', '%Ivan%')
}
projections {
author {
distinct('name')
order('name')
}
}
}
```

---

*Imported from [IDEA-79658](https://youtrack.jetbrains.com/issue/IDEA-79658) · Type: Bug · Votes: 0*
*Comments, attachments, dates and reporter are not part of the export — follow the link above for the full history.*

Start by reproducing the Author and Book example in the issue and trace the Criteria builder's projection handling for nested relations. The work is done when the nested author projection supports distinct('name') and order('name') without errors, while the existing relation filter continues to work.

Written by the indexing model from the issue text.