Strip current namespace from inlay type hints

Feature Request

The inlay type hints for auto types currently always show the full namespace like in the following example:

namespace Test {

struct Struct {};

static auto /* Test::Struct */ x = Struct{};

}

For long nested namespaces, this can quickly add up until the type becomes too long and gets shortened. In that case I can no longer see the actual interesting type name, but only the start of the namespace name, the ellipsis and the end of the type.

When working inside of the namespace, I would normally leave out the namespace when referring to the type as can be seen in the example after the assignment. It would be nice if the inlay type could also do this.

Start by locating the implementation that generates C++ inlay type hints and trace how fully qualified types are formatted within nested namespaces. Done means hints shown inside a namespace omit the current namespace while still displaying the meaningful type name and preserving behavior outside that namespace.