Add go-to implementation that would navigate to signature file

### Details

Relevant Ionide issue: https://github.com/ionide/ionide-vscode-fsharp/issues/1966

### Checklist

- [x] I have looked through existing issues to make sure that this feature has not been requested before
- [x] I have provided a descriptive title for this issue
- [x] I am aware that even valid feature requests may be rejected if they do not align with the project's goals
- [x] I or my company would be willing to contribute this feature