Missing interpolated strings support

Having interpolated strings in file will show an error

Example, running `dscanner lint` on file containing this line:
```d
prompt(i"Set cursor to \"$(cursorName)\"?".text, false);
```

Shows
```
setcursor.d(69:18): Error: Expected `)` instead of stringLiteral `"Set cursor to \"$(cursorName)\"?"` ()
setcursor.d(69:65): Error: Primary expression expected ()
```