Support "Go to definition" for starred variants of commands

Consider the following:
```latex
\NewDocumentCommand{\foo}{s m}{%
    \IfBooleanTF{#1}{\textbf{#2}}{#2}%
}

\foo{bar}
\foo{barr}
\foo*{barrr}
```
"Go to definition" works properly only for the non-starred calls, similarly "Go to references".
I think it would be appropriate to include also starred variants.