Allow intersection types in case of pattern matching

[JaroslavTulach]

As Pavel wrote right now we get syntax error

case ax of
    _: A&X -> ...

fails with:

tmp.enso:27:12: error: Syntax is not supported yet: qualifiedNameSegment.
   27 |         _: A&X -> "Is A&X"
      |            ^~~

[kazcw]

The AST looks reasonable:

> echo -e 'case ax of\n    _: A&X -> 42' | cargo run -p enso-parser-debug --bin enso-parser-debug
(BodyBlock #((CaseOf (Ident ax) #(((() (TypeAnnotated (Wildcard -1) ":" (OprApp (Ident A) (Ok "&") (Ident X))) "->" (Number () "42" ()))))) ()))

The syntax error probably originates in TreeToIr.

[farmaazon]

Is this -parser or some engine label (-compiler or -language-server?)