`NamedCallable` should be a thing

Turns out that it is needed in code, who woulda guessed...

# Workaround
```py
class Named(Protocol):
__name__: str
__qualname__: str

a: "(int) -> str" & Named
```

The issue names no files or tests. Start with the workaround shown in the issue and trace the project's callable typing support to determine the intended NamedCallable shape. Done means the requested type is available without the workaround and its behavior is covered by tests.

Written by the indexing model from the issue text.