Idea: Generate function with caller

cmd+n now opens a nice tooltip that enables me to implement an interface quickly. It would be great to see some same kind of functionality, but not to implement an interface, but to create a new method on a struct.

Right now I am using a live template for this, but the autocomplete that happens during the typing of the receiver struct always messes up the flow of the live template. I.e. when I press tab to jump from the receiver part to the function name, the receiver part or anything there is autocompleted instead.

The proposed functionality would open a tooltip, have you select a struct in the current file, press enter, and it pops out

```

func (r *Receiver) $FUNCNAME$() {

}

```

or something similar. Obviously the naming of the receiver var could be made smart.